TY - INPR A1 - Prasse, Paul A1 - Gruben, Gerrit A1 - Machlika, Lukas A1 - Pevny, Tomas A1 - Sofka, Michal A1 - Scheffer, Tobias T1 - Malware Detection by HTTPS Traffic Analysis N2 - In order to evade detection by network-traffic analysis, a growing proportion of malware uses the encrypted HTTPS protocol. We explore the problem of detecting malware on client computers based on HTTPS traffic analysis. In this setting, malware has to be detected based on the host IP address, ports, timestamp, and data volume information of TCP/IP packets that are sent and received by all the applications on the client. We develop a scalable protocol that allows us to collect network flows of known malicious and benign applications as training data and derive a malware-detection method based on a neural networks and sequence classification. We study the method's ability to detect known and new, unknown malware in a large-scale empirical study. KW - machine learning KW - computer security Y1 - 2017 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-100942 ER - TY - JOUR A1 - Kempert, Sebastian Benjamin A1 - Götz, Regina A1 - Blatter, Kristine A1 - Tibken, Catharina A1 - Artelt, Cordula A1 - Schneider, Wolfgang A1 - Stanat, Petra T1 - Training Early Literacy Related Skills BT - To Which Degree Does a Musical Training Contribute to Phonological Awareness Development? JF - Frontiers in psychology N2 - Well-developed phonological awareness skills are a core prerequisite for early literacy development. Although effective phonological awareness training programs exist, children at risk often do not reach similar levels of phonological awareness after the intervention as children with normally developed skills. Based on theoretical considerations and first promising results the present study explores effects of an early musical training in combination with a conventional phonological training in children with weak phonological awareness skills. Using a quasi-experimental pretest-posttest control group design and measurements across a period of 2 years, we tested the effects of two interventions: a consecutive combination of a musical and a phonological training and a phonological training alone. The design made it possible to disentangle effects of the musical training alone as well the effects of its combination with the phonological training. The outcome measures of these groups were compared with the control group with multivariate analyses, controlling for a number of background variables. The sample included N = 424 German-speaking children aged 4–5 years at the beginning of the study. We found a positive relationship between musical abilities and phonological awareness. Yet, whereas the well-established phonological training produced the expected effects, adding a musical training did not contribute significantly to phonological awareness development. Training effects were partly dependent on the initial level of phonological awareness. Possible reasons for the lack of training effects in the musical part of the combination condition as well as practical implications for early literacy education are discussed. KW - phonological awareness KW - musical training KW - phonological training KW - preschool children KW - early literacy Y1 - 2016 U6 - https://doi.org/10.3389/fpsyg.2016.01803 SN - 1664-1078 VL - 7 PB - Frontiers Research Foundation CY - Lausanne ER - TY - JOUR A1 - Pellanda, Marina T1 - Tarkovsky’s legacy BT - Tarkovskian inspirations in contemporary cinema JF - Andrej Tarkovskij: Klassiker – Классик – Classic – Classico : Beiträge zum internationalen Tarkovskij-Symposium an der Universität Potsdam ; Band 2 Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-100557 SN - 978-3-86956-352-7 SP - 549 EP - 571 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Paperny, Vladimir T1 - Andrej Tarkovskij and Andrej Končalovskij BT - Lives, Films, Culture JF - Andrej Tarkovskij: Klassiker – Классик – Classic – Classico : Beiträge zum internationalen Tarkovskij-Symposium an der Universität Potsdam ; Band 2 Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-100515 SN - 978-3-86956-352-7 SP - 471 EP - 486 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Salvestroni, Simonetta T1 - A Recurring Theme in Tarkovsky’s Cinema BT - The Window as the Entrance to Another Dimension JF - Andrej Tarkovskij: Klassiker – Классик – Classic – Classico : Beiträge zum internationalen Tarkovskij-Symposium an der Universität Potsdam ; Band 2 Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-100472 SN - 978-3-86956-352-7 SP - 399 EP - 407 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Merkur, Lianne T1 - Contentious and Communal Cultural Heritage BT - Excavating the Jewish-Arab City of Lod, Israel JF - PaRDeS : Journal of the Association of Jewish Studies [22 (2016)] = Muslim-Jewish Dialogue JF - PaRDeS : Zeitschrift der Vereinigung für Jüdische Studien [22 (2016)] = Muslim-Jewish Dialogue N2 - Archäologie kann als ein in den Prozess der Identitätsbildung involviertes Werkzeug verstanden werden. Als solches trägt sie zur Schaffung von Zugehörigkeit und Einheit innerhalb einer vielfältigen Reihe von Gemeinden bei. Die Forschung wurde aufgrund des breiten Wahrnehmungsspektrums und Analysepotentials mit Absicht in der gemischten Stadt Lod in Israel durchgeführt. Die Autorin untersuchte die Auswirkungen des städtischen Kulturerbes auf die identitäre Entwicklung der jüdischen und arabischen Kinder vor Ort. Als jüngste aktive Mitglieder der Gesellschaft in der Stadt wurden sie ausgewählt, um an den Grabungen der Saison 2013 im Khan al-Hilu teilzunehmen. Israel ist für solche Forschungen aufgrund seiner Natur, dem gleichzeitig umfangreichen Schwerpunkt der Ausgrabungen und dem anhaltenden, scheinbar unlösbaren Nahostkonflikt der ideale Ort. Die generationenalte Bindung an das Land dient als Grundlage für die kollektive Identität von Arabern und Juden. Doch jede Gemeinschaft und jedes Individuum bezieht sich auf unterschiedliche archäologische Stätten, die durch ihre Bedeutung als kulturelles Erbe und ihren Wert für die jeweilige Gruppe geprägt sind. N2 - Archaeology can be understood as a tool used in the process of identity formation, contributing to a sense of belonging and unity within a diverse set of communities. Research was conducted with the intention of analyzing the wide range of perceptions regarding archaeological sites in the mixed city of Lod, Israel. I explored the impact of urban cultural heritage on shaping the identity of local Jewish and Arab children, who were chosen as the youngest active members of society living in the city, and who participated in the 2013 archaeological excavation season at the Khan al-Hilu. Israel is an ideal location for such research, due to its nature as simultaneously being the focus of extensive archaeological excavations as well as being the setting of an intractable conflict. Ancestral attachment to the land serves as a foundation for the collective identity of both Jews and Arabs. Yet, each community and individual may relate differently to the surrounding archaeological sites, which is further shaped by their sense of societal hierarchy and cultural heritage. Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-99665 SN - 978-3-86956-370-1 SN - 1614-6492 SN - 1862-7684 VL - 22 SP - 151 EP - 164 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Anzi, Menashe T1 - ʿAgunot and Converts to Islam BT - Jews and Muslims in Yemen from 1950 to 1962 JF - PaRDeS : Journal of the Association of Jewish Studies [22 (2016)] = Muslim-Jewish Dialogue JF - PaRDeS : Zeitschrift der Vereinigung für Jüdische Studien [22 (2016)] = Muslim-Jewish Dialogue N2 - Nach der Massenemigration der jemenitischen Juden nach Israel zwischen 1948 und 1950 sind ca. 2000 Juden im Jemen zurückgeblieben. Viele sind danach mit Hilfe der Jewish Agency und des JDC nach Israel eingewandert. Die wenigen Zurückgebliebenen lebten in kleinen Gemeinden, behielten jedoch ihre religiösen Bräuche bei. Deren Verteilung unter der muslimischen Bevölkerung führte jedoch zur Annäherung zwischen Juden und Muslimen. Rund zehn Prozent sind zum Islam übergetreten, teils als Einzelpersonen, teils als Gruppen. Dabei gab es etwa zwanzig Fälle von Männern, die zum Islam übertraten, deren Frauen aber nach Israel auswanderten und das Judentum beibehielten. Aufgrund des Abbruchs der ehelichen Beziehung nach islamischem Recht haben sich einige Konvertiten geweigert ihren Frauen die Scheidung zu gewähren. Dieser Beitrag geht den Bemühungen zur Befreiung der ʿAgunot nach. Es wird gezeigt, wie jüdische und muslimische Gelehrte gemeinsam nach Lösungen suchten und Brücken zwischen ihren Religionsgemeinschaften schlugen. N2 - After the mass immigration to Israel from 1948 to 1950, about 2000 Jews remained in Yemen. These Jews lived in small communities and continued to maintain their religious environment as it was. In the years that followed, many of them, however, moved from Yemen to Israel with the assistance of the Jewish Agency and the Joint Distribution Committee (JDC). The community was of a small size and the fact that it was dispersed throughout the predominantly Muslim areas, created a certain closeness between the two groups. About ten percent of the Jews chose to convert to Islam, many of them in groups. In about twenty cases, the husbands chose to convert to Islam while their wives emigrated to preserve their Judaism. Some of the converts refused to grant their wives a divorce, because, according to Muslim law, conversion is enough to sever the marital relationship. This procedure is called ʿAgunot. Meaning, women bound in marriage to a husband and they no longer lived together, but the husband didn’t formally ‘released’ her from marriage union. The article follows the efforts undertaken to release the ʿAgunot, and shows that Jewish and Muslim scholars were able to find solutions to the ʿAgunot problem and, at times, managed to bridge the gap between the two religions. Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-99658 SN - 978-3-86956-370-1 SN - 1614-6492 SN - 1862-7684 VL - 22 SP - 135 EP - 149 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Tarabieh, Abdallah A1 - Yeshaya, Joachim T1 - The Themes of Calling for Help and Redemption in Arabic and Hebrew Poems from Medieval Spain during the Eleventh and Twelfth Century JF - PaRDeS : Journal of the Association of Jewish Studies [22 (2016)] = Muslim-Jewish Dialogue JF - PaRDeS : Zeitschrift der Vereinigung für Jüdische Studien [22 (2016)] = Muslim-Jewish Dialogue N2 - In this article we will present a few examples of the theme of “calling for help and redemption” in Arabic and Hebrew poetry, with particular focus on eleventh and twelfth century Muslim Spain. More particularly, we will offer a glimpse into the life and oeuvre of two medieval poets (one Muslim, one Jewish); both were active in Muslim Spain in the same period and shared a similar fate of exile and wandering: on the one hand, the Sicilian Arabic poet Ibn Ḥamdīs (c. 1056–c. 1133) and on the other hand, the Spanish Jewish poet Moses ibn Ezra (1055–1138). We will take into account the impact of exile and wandering on the profusion of the theme of “calling for help and redemption” as well as the related theme of “yearning for one’s homeland” through an analysis and comparison of poetic fragments by the two aforementioned poets as well as additional Andalusian Jewish (Judah ha-Levi) and Muslim (Ibn Khafāja, al-Rundī and Ibn al-Abbār) poets. N2 - In diesem Artikel werden einige Beispiele der Themen „Anrufung um Hilfe und Erlösung“ in der arabischen und hebräischen Poesie, im speziellem die des 11. und 12. Jahrhunderts im muslimischen Spaniens, erläutert. Des Weiteren wird ein kurzer Einblick in das Leben zweier Dichter des Mittelalters gewährt: Der sizilianisch-arabische Dichter Ibn Ḥamdīs (ca. 1056–ca. 1133) und der spanisch-jüdische Dichter Moses ibn Ezra (1055–1138). Beide waren zur gleichen Zeit im muslimischen Spanien tätig und teilten das Schicksal der Flucht und des Exils. Unter Berücksichtigung der Exilsituation werden die Topoi Anrufung um Beistand und Erlösung sowie das verwandte Motiv des Heimwehs nach dem Vaterland durch eine komparative Analyse in Bezug auf andere andalusisch-jüdische und muslimische Dichter erörtert. Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-99645 SN - 978-3-86956-370-1 SN - 1614-6492 SN - 1862-7684 VL - 22 SP - 121 EP - 133 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Zoref, Arye T1 - Journeys for God in Ṣūfī and Judeo Arabic Literature JF - PaRDeS : Journal of the Association of Jewish Studies [22 (2016)] = Muslim-Jewish Dialogue JF - PaRDeS : Zeitschrift der Vereinigung für Jüdische Studien [22 (2016)] = Muslim-Jewish Dialogue N2 - Das Konzept der drei Reisen als einen Weg zur spirituellen Entwicklung wurde von einem der Gründerväter der islamischen Mystik, Dhu al-Nun, eingeführt. Später wurde die Anwendung des Konzepts verfeinert, indem es mit der sufischen Technik verschiedene Präpositionen hinzuzufügen kombiniert wurde, um dadurch zwischen den spirituellen Stufen zu unterscheiden. Mit der Verwendung der Wörter Reise (Safar) und Gott (Allah) und dem Hinzufügen einer Präposition zum Wort Gott konnten sufische Schriftsteller die verschiedenen Wege zu Gott oder die Stationen (Maqamat) auf diesem Weg aufzeichnen. Ibn al-’Arabi spricht Anfang des dreizehnten Jahrhunderts von drei verschiedenen Wegen: von Gott, zu Gott und in Gott. Am Ende des dreizehnten Jahrhunderts spricht der jüdisch-arabische Bibelkommentator Tanchum ha-Yerushalmi von den drei Reisen als drei Stationen eines kontinuierlichen Weges. Eine nahezu identische Beschreibung ist eine Generation danach beim muslimischen Gelehrten Qayyim al-Jawziyya zu finden. Aus den drei Reisen werden im vierzehnten Jahrhundert in den Schriften des sufischen Schriftstellers al-Qashani vier, wobei das Schema der drei Präpositionen beibehalten wurde. Kurz vor dem Ende des vierzehnten Jahrhunderts sind in den Schriften von R. David ha-Nagid nur noch zwei Reisen zu finden: zu Gott und in Gott. All dies zeigt uns, dass uns die jüdisch-arabische Literatur dabei helfen kann die geschichtliche Entwicklung der sufischen Ideen genauer nachzuzeichnen. N2 - The concept of three journeys as a way to denote spiritual development was introduced by Dhu al-Nun, one of the founding fathers of Islamic mysticism. The use of this concept was later refined by combining it with the Sufi technique of adding different prepositions to a certain term, in order to differentiate between spiritual stages. By using the words journey (Safar) and God (Allah) and inserting a preposition before the word God, Sufi writers could map the different roads to God or the stations (Maqamat) on this road. Ibn al-'Arabi, in the beginning of the thirteenth century, speaks of three different ways: from God, toward God and in God. Tanchum ha-Yerushalmi, the Judeo Arabic biblical commentator from the end of this century, speaks of the three journeys as three stations of one continuous way. A nearly identical description we can find in the writing of the Muslim scholar Ibn Qayyim al-Jawziyya, a generation later. Later in the fourteenth century, in the writing of the Sufi writer al-Qashani, the three travels become four, although the scheme of three prepositions is preserved. Near the end of the fourteenth century, in the writings of R. David ha-Nagid, we find only two journeys: to God and in God. All this tells us that Judeo Arabic literature can help us map with greater precision the historical development of Sufi ideas. Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-99635 SN - 978-3-86956-370-1 SN - 1614-6492 SN - 1862-7684 VL - 22 SP - 109 EP - 119 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Saritoprak, Zeki T1 - The Place of Moses in the Qurʼan and Its Significance for a Jewish-Muslim Dialogue JF - PaRDeS : Journal of the Association of Jewish Studies [22 (2016)] = Muslim-Jewish Dialogue JF - PaRDeS : Zeitschrift der Vereinigung für Jüdische Studien [22 (2016)] = Muslim-Jewish Dialogue N2 - Die Figur des Moses konstituiert eine wichtige Verbindung zwischen jüdischen und muslimischen Traditionen. Im islamischen Sinne ist Moses einer der fünf Hauptpropheten Gottes. Seine Geschichte bestimmt daher einen maßgeblichen Stellenwert im Koran und obwohl kleinere Unterschiede vorherrschen, ist es die koranische Geschichte des Moses, die die der Tora bestätigt. Sein Leben ist daher als Vorbild für Muslime zu sehen. Einzelne Elemente seiner Geschichte finden sich an verschiedenen Stellen des Korans; es ist jedoch das siebte Kapitel, welches das Leben Moses im Detail beschreibt. Der Text wird sich daher auf dieses Kapitel konzentrieren, da es jene Ereignisse im Leben des Moses beschreibt, die zum einen essentiell für Muslime und Juden sind und zum anderen die Signifikanz und Frömmigkeit des Moses aufzeigt. Auch bringt dieses Kapitel die Ähnlichkeiten des islamischen Moses und des jüdischen Moses zum Vorschein. Anhand einer Untersuchung der im Koran aufgeführten Ereignisse im Leben des Moses wird er zu einer Schlüsselfigur um Freundschaft, Harmonie und Frieden zwischen Juden und Muslime zu schaffen. Moses wird somit zum gemeinsamen Nenner um einen Dialog zwischen den beiden Religionen zu kreieren und ihrer Hingabe den ‚Einen Gott’ zu huldigen voran zu treiben. N2 - The figure of Moses constitutes an important link between Jewish and Muslim traditions. Muslims consider him to be one of the five elite prophets of God, his story therefore has a prominent place in the Qurʼan. While there are minor differences, the story of Moses found in the Qurʼan confirms the account of the Torah; the life of Moses thus is considered a model for all Muslims to follow. Though elements of his story are found throughout the Qurʼan, it is in chapter 7 where it is given in its greatest detail. As the focus point of this article, chapter 7 discusses many events in Mosesʼ life, which are important for both Muslims and Jews, and reveals his great importance and Godliness. It also demonstrates how truly similar Islamʼs Moses and Judaismʼs Moses are. Therefore, through an examination of the various elements of the story of Moses as found in the Qurʼan, this article will show how by following him, Jews and Muslims can come together in friendship, harmony and peace. Moses is the common ground on which Jews and Muslims can come together in order to open up a dialogue and further their shared commitment to the worship of the One God. Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-99581 SN - 978-3-86956-370-1 SN - 1614-6492 SN - 1862-7684 VL - 22 SP - 17 EP - 29 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - GEN A1 - Tremblay, Jean Christophe A1 - Blanco-Rey, Maria T1 - Manipulating interfacial hydrogens at palladium via STM N2 - In this contribution, we provide a detailed dynamical analysis of the interfacial hydrogen migration mediated by scanning tunneling microscopy (STM). Contributions from the STM-current and from the non-adiabatic couplings are taken into account using only first principle models. The slight asymmetry of the tunnelling rates with respect to the potential bias sign inferred from experimental observations is reproduced by weighting the contributions of the metal acceptor–donor states for the propagation of the impinging electrons. The quasi-thermal inelastic collision mechanism is treated perturbatively. The influence of hydrogen pre-coverage is also investigated using new potential energy surfaces obtained from periodic density functional theory calculations. Fully quantum dynamical simulations of the system evolution are performed by solving the Pauli master equation, providing insight into the reaction mechanism of STM manipulation of subsurface hydrogens. It is observed that the hydrogen impurity favors resurfacing over occupation of the bulk and subsurface sites whenever possible. The present simulations give strong indication that the experimentally observed protuberances after STM-excitation are due to hydrogen accumulating in the vicinity of the surface. T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 291 Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-99511 ER - TY - GEN A1 - Thieken, Annegret A1 - Bessel, Tina A1 - Kienzler, Sarah A1 - Kreibich, Heidi A1 - Müller, Meike A1 - Pisi, Sebastian A1 - Schröter, Kai T1 - The flood of June 2013 in Germany BT - how much do we know about its impacts? T2 - National Hazards Earth System Science N2 - In June 2013, widespread flooding and consequent damage and losses occurred in Central Europe, especially in Germany. This paper explores what data are available to investigate the adverse impacts of the event, what kind of information can be retrieved from these data and how well data and information fulfil requirements that were recently proposed for disaster reporting on the European and international levels. In accordance with the European Floods Directive (2007/60/EC), impacts on human health, economic activities (and assets), cultural heritage and the environment are described on the national and sub-national scale. Information from governmental reports is complemented by communications on traffic disruptions and surveys of flood-affected residents and companies. Overall, the impacts of the flood event in 2013 were manifold. The study reveals that flood-affected residents suffered from a large range of impacts, among which mental health and supply problems were perceived more seriously than financial losses. The most frequent damage type among affected companies was business interruption. This demonstrates that the current scientific focus on direct (financial) damage is insufficient to describe the overall impacts and severity of flood events. The case further demonstrates that procedures and standards for impact data collection in Germany are widely missing. Present impact data in Germany are fragmentary, heterogeneous, incomplete and difficult to access. In order to fulfil, for example, the monitoring and reporting requirements of the Sendai Framework for Disaster Risk Reduction 2015–2030 that was adopted in March 2015 in Sendai, Japan, more efforts on impact data collection are needed. Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-97207 ER - TY - JOUR A1 - Keir, Jonathan T1 - Through Christendom and Beyond BT - Andrei Tarkovsky and the Global Ethic Project JF - Andrej Tarkovskij: Klassiker – Классик – Classic – Classico : Beiträge zum internationalen Tarkovskij-Symposium an der Universität Potsdam ; Band 1 Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-95618 SN - 978-3-86956-351-0 SP - 237 EP - 254 PB - Uiversitä Potsdam CY - Potsdam ER - TY - JOUR A1 - Efird, Robert T1 - Beyond the Crystal-Image BT - Perception and Temporality in Tarkovsky’s Early Films JF - Andrej Tarkovskij: Klassiker – Классик – Classic – Classico : Beiträge zum internationalen Tarkovskij-Symposium an der Universität Potsdam ; Band 1 Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-95626 SN - 978-3-86956-351-0 SP - 255 EP - 265 PB - Universität Potsdam CY - Potsdam ER - TY - JOUR A1 - Dulgheru, Elena T1 - A Conjunction of Mysteries BT - Tarkovskij’s Off ret and da Vinci’s Adoraz ione dei magi JF - Andrej Tarkovskij: Klassiker – Классик – Classic – Classico : Beiträge zum internationalen Tarkovskij-Symposium an der Universität Potsdam ; Band 1 Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-95594 SN - 978-3-86956-351-0 SP - 201 EP - 214 PB - Universität Potsdam CY - Potsdam ER - TY - JOUR A1 - Synessios, Natasha T1 - Andrei Tarkovsky – Self, World, Flesh JF - Andrej Tarkovskij: Klassiker – Классик – Classic – Classico : Beiträge zum internationalen Tarkovskij-Symposium an der Universität Potsdam ; Band 1 Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-95532 SN - 978-3-86956-351-0 SP - 65 EP - 83 PB - Universität Potsdam CY - Posdam ER - TY - GEN A1 - Priewe, Marc T1 - Walter W. Woodward, Prospero´s America: John Winthrop, Jr., Alchemy, and the Creation of New England Culture, 1606-1676 / [rezensiert von] Marc Priewe N2 - Rezensiertes Werk: Walter W. Woodward: Prospero’s America: John Winthrop, Jr., Alchemy, and the Creation of New England Culture, 1606-1676. Chapel Hill: University of North Carolina Press, 2010. Hb. 336pp. ISBN 978-0-8078-3301-8. T3 - Zweitveröffentlichungen der Universität Potsdam : Philosophische Reihe - 104 Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-93713 SP - 199 EP - 200 ER - TY - JOUR A1 - Matijević, Tijana T1 - National, post-national, transnational BT - Is post-Yugoslav literature an arguable or promising field of study? JF - Grenzräume – Grenzbewegungen : Ergebnisse der Arbeitstreffen des Jungen Forums Slavistische Literaturwissenschaft in Basel 2013 und Frankfurt (Oder) und Słubice 2014 ; Bd. 1 Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-92573 SN - 978-3-86956-358-9 VL - 1 SP - 101 EP - 112 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Korat, Omer ED - Grubic, Mira ED - Mucha, Anne T1 - Singular quantified terms JF - Proceedings of the Semantics of African, Asian and Austronesian Languages (TripleA) 2 N2 - In this paper, I discuss the behavior of singular partitives, focusing on Hebrew. I show that group noun-headed singular quantified terms behave essentially different from other singular quantified terms. Specifically, the domain of quantification in the former is a discrete set (the members of the group), while in the latter the domain of quantification is a set of mass entities. I propose a preliminary analysis of singular quantified terms in Hebrew, respecting the properties peculiar to this language as well as the observations about group vs. non-group singular quantified terms. This analysis is based on a novel class of quantifiers I name ’Measure Quantifiers’, which instantiate relations between algebraic sums. Using shifts between algebraic sums, we can represent the different readings of singular and plural individual or group terms. Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-92313 SP - 36 EP - 51 ER - TY - JOUR A1 - Hsieh, I-Ta Chris A1 - Shen, Zheng ED - Grubic, Mira ED - Mucha, Anne T1 - The ‘Associative Reading’ of DPs and the quantity vs. quality distinction JF - Proceedings of the Semantics of African, Asian and Austronesian Languages (TripleA) 2 N2 - This paper investigates an unnoticed difference in Mandarin between the Q-adjectives and the gradable adjectives of quality and shows that this observation follows straightforwardly from a theory that differentiates gradable predication of quantity and that of quality (e.g., Rett 2008; Lin 2014; Solt 2015; a.o.). Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-92304 SP - 18 EP - 35 ER - TY - JOUR A1 - Bowler, Margit ED - Grubic, Mira ED - Mucha, Anne T1 - The status of degrees in Warlpiri JF - Proceedings of the Semantics of African, Asian and Austronesian Languages (TripleA) 2 N2 - Recent work in semantics has shown that languages can vary in whether or not they include degrees (that is, elements of type < d >) in their semantic ontology. Several authors have argued that their languages of study lack degrees, including Bochnak (2013) for Washo (isolate, USA), Pearson (2009) for Fijian (Austronesian, Fiji), and Beck, et al. (2009) for Motu (Austronesian, Papua New Guinea). In this paper, I follow the tests proposed in Beck, et al. (2009) to assess the status of degrees in Warlpiri (Pama-Nyungan, Australia). I use Warlpiri data collected following the Beck, et al. survey to argue that Warlpiri gradable predicates do not combine with a degree argument. (Like many other Australian languages, adjectival concepts like big and small are expressed using nouns in Warlpiri (Dixon 1982, Bittner & Hale 1995, among others). I refer to these lexical items as “gradable predicates” in this paper.) This paper represents a first pass at assessing the status of degrees in an Australian language, which have otherwise been unexamined from the point of view of degree semantics. Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-92295 SP - 1 EP - 17 ER - TY - JOUR A1 - Puig-Samper, Miguel Ángel A1 - Garrido, Elisa T1 - The presentation of the results of Alexander von Humboldt's voyage to Carlos IV JF - HiN : Alexander von Humboldt im Netz ; International Review for Humboldtian Studies N2 - Ever since our first research into Alexander von Humboldt's stay in Spain, the absence of an ensuing relationship between the wise Prussian and the Spanish Crown and Authorities had always surprised us. On starting new research, we found that indeed he sent his first work to Carlos IV from Rome accompanied by a letter of gratitude for the protection he had received during his American trip and submission to the Spanish Crown, which we now present. This first literary fruit of his voyage, which Alexander von Humboldt alluded to in the letter is the first instalment of his work Plantes Équinoxiales, Recueillies au Mexique, dans l’ile de Cuba, dans les provinces de Caracas, de Cumana etc., published in Paris in 1805. N2 - Desde nuestras primeras investigaciones sobre la estancia de Alexander von Humboldt en España siempre nos sorprendió la ausencia de una mínima relación posterior del sabio prusiano con la corona española y sus autoridades. Iniciada una nueva investigación, encontramos que efectivamente se produjo el envío de un primer trabajo a Carlos IV desde Roma acompañado de una carta de gratitud por la protección recibida durante su viaje americano y de sumisión a la corona española, que ahora presentamos. N2 - Seit unseren ersten Forschungen über den Aufenthalt Alexander von Humboldts in Spanien hat uns das Fehlen einer hieran anschließenden Beziehung des preußischen Wissenschaftlers mit der spanischen Krone und ihren Behörden erstaunt. Im Laufe einer erneuten Aufnahme der Forschung, haben wir nun entdeckt, dass Humboldt in der Tat von Rom aus eine erste Arbeit an Karl IV gesandt hatte, zusammen mit einem Schreiben des Dankes (für den während der amerikanischen Reise) erhaltenen Schutz sowie seiner Unterordnung unter die spanische Krone, das wir nun präsentieren. Das erste literarische Ergebnis seiner Reise, auf das Humboldt in diesem Brief verweist, ist der erste Faszikel seines Werkes Plantes Équinoxiales, Recueillies au Mexique, dans l’ile de Cuba, dans les provinces de Caracas, de Cumana etc., das im Jahr 1805 in Paris publiziert wurde. KW - Humboldt KW - travel results KW - Plantes Équinoxiales KW - Carlos IV KW - Spain Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-90788 SN - 1617-5239 SN - 2568-3543 VL - XVII IS - 32 SP - 52 EP - 64 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Sugawara, Y. A1 - Tsuboi, Y. A1 - Maeda, Y. A1 - Pollock, A. M. T. A1 - Williams, P. M. T1 - The Swift monitoring of the colliding wind binary WR 21a JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - The X-ray observations of the colliding wind binary WR 21a is reported. The first monitoring performed by Swift/XRT in order to reveal the phase-locked variation. Our observations cover 201 different epochs from 2013 October 1 to 2015 January 30 for a total exposure of about 306 ks. It is found for the first time that the luminosity varies roughly in inverse proportion to the separation of the two stars before the X-ray maximum but later drops rapidly toward periastron. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88517 SP - 366 ER - TY - JOUR A1 - Ro, S. A1 - Matzner, C. D. T1 - Envelope Inflation or Stellar Wind? JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - We an optically-thick, transonic, steady wind model for a H-free Wolf-Rayet star. A bifurcation is found across a critical mass loss rate Mb. Slower winds M < Mb extend by several hydrostatic stellar radii, reproduce features of envelope in ation from Petrovic et al. (2006) and Gräfener et al. (2012), and are energetically unbound. This work is of particular interest for extended envelopes and winds, radiative hydrodynamic instabilities (eg. wind stagnation, clumping, etc.), and NLTE atmospheric models. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88491 SP - 364 ER - TY - JOUR A1 - Reyes-Iturbide, J. A1 - Velázquez, Pablo F. A1 - Rosado, M. T1 - 3D numerical model for NGC 6888 Nebula JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - We present 3D numerical simulations of the NGC6888 nebula considering the proper motion and the evolution of the star, from the red supergiant (RSG) to the Wolf-Rayet (WR) phase. Our simulations reproduce the limb-brightened morphology observed in [OIII] and X-ray emission maps. The synthetic maps computed by the numerical simulations show filamentary and clumpy structures produced by instabilities triggered in the interaction between the WR wind and the RSG shell. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88485 SP - 363 ER - TY - JOUR A1 - Ramírez Alegría, S. A1 - Chené, A.-N. A1 - Borissova, J. A1 - Kurtev, R. A1 - Navarro, C. A1 - Kuhn, M. A1 - Carballo-Bello, J. A. T1 - A not so massive cluster hosting a very massive star JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - We present the first physical characterization of the young open cluster VVVCL041. We spectroscopically observed the cluster main-sequence stellar population and a very-massive star candidate: WR62-2. CMFGEN modelling to our near-infrared spectra indicates that WR62-2 is a very luminous (10^6.4±0.2 L⊙)and massive (∼ 80M⊙) star. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88477 SP - 362 ER - TY - JOUR A1 - Maryeva, O. A1 - Polcaro, V. F. A1 - Rossi, C. A1 - Viotti, R. T1 - Modeling of spectral variability of Romano's star JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - We present results of investigation of spectral variability of one of the most interesting massive stars, Romano's star (M33/V532 or GR290), located in the M33 galaxy. Brightness of the star changes together with its spectral class, which varies from WN11 to WN8. Using CMFGEN code we estimated parameters of stellar atmosphere and found that during last ten years bolometric luminosity of the star changed synchronously with stellar magnitude. Our calculations argue in favor of the hypothesis of a post-LBV status of GR290. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88462 SP - 361 ER - TY - JOUR A1 - Kochiashvili, N. A1 - Beradze, S. A1 - Kochiashvili, I. A1 - Natsvlishvili, R. A1 - Vardosanidze, M. T1 - New Photometric Observations of P Cygni JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - We present the results of the new photometric observations of the famous hypergiant PCygni. New observations were obtained in 2014 using the 48 cm Cassegrain telescope of the Abastumani Astrophysical Observatory, Georgia. We reveal some interesting behaviors of the B,V,R,I light curves, and also report new results on the periodicity of PCygni's variation. The latter result is based on the analysis of the photometric data (U,B,V filters) collected at the Abastumani Observatory between 1937 and 1983. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88452 SP - 360 ER - TY - JOUR A1 - Kanarek, G. A1 - Shara, M. A1 - Faherty, J. A1 - Zurek, D. A1 - Moffat, Anthony F. J. T1 - New Galactic Wolf-Rayet Stars JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Over the course of 6 months in 2013, we observed nearly 400 Wolf-Rayet candidates in the Galactic plane. Preliminary results from this dataset are presented. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88448 SP - 359 ER - TY - JOUR A1 - Gormaz-Matamala, A. C. A1 - Hervé, A. A1 - Chené, A.-N. A1 - Curé, M. A1 - Mennickent, R. E. T1 - Results Of The Spectroscopic Analysis Of WR6 Using CMFGEN JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Using ESPaDOnS optical spectra of WR6, we search variations on the stellar wind parameters during the different phases of the spectral variations. We use the radiative transfer code CMFGEN (Hillier & Miller 1998) to determine the wind parameters. Our work gives mean parameters for WR6, Teff = 55 kK, M = 2.7 × 10^-5 M⊙/yr and v∞ =1700 km/s. Furthermore the line profiles variations at different phases are the consequence of a variation of mass loss rate and temperature un the winds. Effective temperature reaches 59 kK at the highest intensity, whereas the mass-loss rate decreases to 2.5 × 10^-5 M⊙/yr in that case. On the other hand, effective temperature decreases to 52.5 kK and the mass-loss rate increases to 3 × 10^-5 M/⊙yr when the line profile reach its minimum intensity. Results confirm the variable nature of the stellar wind, presented in this case on two of its fundamental parameters: temperature and mass-loss; which could be used to constrain the nature of the instability at the basis of the wind. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88422 SP - 357 ER - TY - JOUR A1 - Calderón, D. A1 - Ballone, A. A1 - Cuadra, J. A1 - Schartmann, M. A1 - Burkert, Andreas A1 - Gillessen, S. T1 - Formation of the infalling Galactic Centre cloud G2 by collision of stellar winds JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - The gas cloud G2 is currently being tidally disrupted by the Galactic Centre super-massive black hole, Sgr A*. The region around the black hole is populated by ∼ 30 Wolf-Rayet stars, which produce strong outflows. Here we explore the possibility that gas clumps like G2 originate from the collision of stellar winds via the non-linear thin shell instability. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88412 SP - 356 ER - TY - JOUR A1 - Bibby, J. A1 - Shara, M. A1 - Zurek, D. A1 - Crowther, P. A. A1 - Moffat, Anthony F. J. A1 - Drissen, L. A1 - Wilde, M. T1 - The Distribution of Massive Stars in M101 JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - 75 WR stars and 164 RSGs are identified in a single WFC3 pointing of our M101 survey. We find that within it's large star-forming complex NGC 5462 WR stars are preferentially located in the core whilst RSGs are found in the halo, suggesting two bursts of star-formation. A review of our WR candidates reveals that only ∼30% are detected in the archival broad-band ACS imaging whilst only ∼50% are associated with HII regions. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88402 SP - 355 ER - TY - JOUR A1 - Bestenlehner, J. M. T1 - Stellar parameters from photometric data for fainter and more distant Wolf-Rayet stars JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Spectroscopy is the preferred way to study the physical and wind properties of Wolf-Rayet (WR) stars, but with decreasing brightness and increasing distance of the object spectroscopy become very expensive. However, photometry still delivers a high signal to noise ratio. Current and past astronomical surveys and space missions provide large data sets, that can be harvested to discover new WR stars and study them over a wide metallicity range with the help of state of the art stellar atmosphere and evolutionary models. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88390 SP - 354 ER - TY - JOUR A1 - Beradze, S. A1 - Kochiashvili, N. A1 - Natsvlishvili, R. A1 - Kochiashvili, I. A1 - Janiashvili, E. A1 - Urushadze, T. A1 - Vardosanidze, M. T1 - P Cygni and its Observations at the Abastumani Observatory JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - We found original observations of PCygni by E. Kharadze and N. Magalashvili in the archives of the Abastumani Observatory. These observations were carried out in the period 1951–1983. Initially they used 29 Cygni as a comparison star, and all observations of PCygni were processed using this star. On the basis of their calculations, the authors decided that PCygni may be a WUMa type binary with an orbital period of 0.500565 d, but this hypothesis was not confirmed. The only observations that have been published in the Bulletin of the Abastumani Astrophysical Observatory were those of of 1951–1955. There are whole sets of observational data not only for PCygni and 29 Cygni, but in the majority of cases also for 36 Cygni in the archives. We recalculated all data (where it was possible) using 36 Cygni as a comparison star. We are presenting UBV light curves of the variable, and also observations made by V. Nikonov in Abastumani in the period 1935–1937 Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88389 SP - 353 ER - TY - JOUR A1 - Conti, P. S. T1 - Concluding Remarks JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Selected remarks concerning Wolf-Rayet (W-R) stars in the framework of this workshop are given. The rich history of international conferences over the past four or so decades is summarized, important issues concerning W-R stars are considered, and some outstanding problems are reviewed. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88347 SP - 347 EP - 350 ER - TY - JOUR A1 - Walsh, J. R. A1 - Monreal-Ibero, A. A1 - Vílchez, J. M. A1 - Pérez-Montero, E. A1 - Iglesias-Páramo, J. A1 - Sandin, C. A1 - Relano, M. A1 - Amorín, R. T1 - The Wolf-Rayet Population and ISM Interaction in Nearby Starbursts JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - The interaction between massive star formation and gas is a key ingredient in galaxy evolution. Given the level of observational detail currently achievable in nearby starbursts, they constitute ideal laboratories to study interaction process that contribute to global evolution in all types of galaxies. Wolf-Rayet (WR) stars, as an observational marker of high mass star formation, play a pivotal role and their winds can strongly influence the surrounding gas. Imaging spectroscopy of two nearby (<4 Mpc) starbursts, both of which show multiple regions with WR stars, are discussed. The relation between the WR content and the physical and chemical properties of the surrounding ionized gas is explored. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88339 SP - 341 EP - 344 ER - TY - JOUR A1 - Sokal, K. R. A1 - Johnson, K. E. A1 - Massey, P. A1 - Indebetouw, R. T1 - The importance of Wolf-Rayet ionization and feedback on super star cluster evolution JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - The feedback from massive stars is important to super star cluster (SSC) evolution and the timescales on which it occurs. SSCs form embedded in thick material, and eventually, the cluster is cleared out and revealed at optical wavelengths – however, this transition is not well understood. We are investigating this critical SSC evolutionary transition with a multi-wavelength observational campaign. Although previously thought to appear after the cluster has fully removed embedding natal material, we have found that SSCs may host large populations of Wolf-Rayet stars. These evolved stars provide ionization and mechanical feedback that we hypothesize is the tipping point in the combined feedback processes that drive a SSC to emerge. Utilizing optical spectra obtained with the 4m Mayall Telescope at Kitt Peak National Observatory and the 6.5m MMT, we have compiled a sample of embedded SSCs that are likely undergoing this short-lived evolutionary phase and in which we confirm the presence of Wolf-Rayet stars. Early results suggest that WRs may accelerate the cluster emergence. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88325 SP - 337 EP - 340 ER - TY - JOUR A1 - Toalá, Jesús Alberto A1 - Guerrero, Martín A. A1 - Chu, Y.-H. A1 - Arthur, S. J. A1 - Gruendl, R. A. T1 - Diffuse X-ray Emission within Wolf-Rayet Nebulae JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - We discuss our most recent findings on the diffuse X-ray emission within Wolf-Rayet (WR) nebulae. The best-quality X-ray observations of these objects are those performed by XMM- Newton and Chandra towards S 308, NGC 2359, and NGC 6888. Even though these three WR nebulae might have different formation scenarios, they all share similar characteristics: i) the main plasma temperatures of the X-ray-emitting gas is found to be T =[1–2]×^K, ii) the diffuse X-ray emission is confined inside the [O iii] shell, and iii) their X-ray luminosities and electron densities in the 0.3–2.0 keV energy range are LX ≈10^33–10^34 erg s-1 and ne ≈0.1–1 cm^-3 . These properties and the nebular-like abundances of the hot gas suggest mixing and/or thermal conduction is taking an important rôle reducing the temperature of the hot bubble. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88316 SP - 333 EP - 336 ER - TY - JOUR A1 - Dwarkadas, Vikram V. A1 - Rosenberg, D. T1 - X-ray Emission from Ionized Wind-Bubbles around Wolf-Rayet Stars JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Using a code that employs a self-consistent method for computing the effects of photoionization on circumstellar gas dynamics, we model the formation of wind-driven nebulae around massive Wolf-Rayet (W-R) stars. Our algorithm incorporates a simplified model of the photo-ionization source, computes the fractional ionization of hydrogen due to the photoionizing flux and recombination, and determines self-consistently the energy balance due to ionization, photo-heating and radiative cooling. We take into account changes in stellar properties and mass-loss over the star's evolution. Our multi-dimensional simulations clearly reveal the presence of strong ionization front instabilities. Using various X-ray emission models, and abundances consistent with those derived for W-R nebulae, we compute the X-ray flux and spectra from our wind bubble models. We show the evolution of the X-ray spectral features with time over the evolution of the star, taking the absorption of the X-rays by the ionized bubble into account. Our simulated X-ray spectra compare reasonably well with observed spectra of Wolf-Rayet bubbles. They suggest that X-ray nebulae around massive stars may not be easily detectable, consistent with observations.∗ Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88301 SP - 329 EP - 332 ER - TY - JOUR A1 - Mesa-Delgado, A. A1 - Esteban, C. A1 - García-Rojas, J. T1 - Ring Nebulae BT - Tracers of the CNO Nucleosynthesis JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Preliminary results are presented from spectroscopic data in the optical range of the Galactic ring nebulae NGC 6888, G2:4+1:4, RCW 58 and Sh2-308. Deep observations with long exposure times were carried out at the 6.5m Clay Telescope and at the 10.4m Gran Telescopio Canarias. In NGC 6888, recombination lines of C ii, O ii and N ii are detected with signal-to-noise ratios higher than 8. The chemical content of NGC 6888 is discussed within the chemical enrichment predicted by evolution models of massive stars. For all nebulae, a forthcoming work will content in-depth details about observations, analysis and final results (Esteban et al. 2015, in prep.). Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88299 SP - 325 EP - 328 ER - TY - JOUR A1 - Reyes-Pérez, J. A1 - Morisset, C. A1 - Pena, M. A1 - Mesa-Delgado, A. T1 - A consistent spectral model of WR 136 and its associated bubble NGC 6888 JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - We analyse whether a stellar atmosphere model computed with the code CMFGEN provides an optimal description of the stellar observations of WR 136 and simultaneously reproduces the nebular observations of NGC 6888, such as the ionization degree, which is modelled with the pyCloudy code. All the observational material available (far and near UV and optical spectra) were used to constrain such models. We found that the stellar temperature T∗, at τ = 20, can be in a range between 70 000 and 110 000 K, but when using the nebula as an additional restriction, we found that the stellar models with T∗ ∼ 70 000 K represent the best solution for both, the star and the nebula. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88274 SP - 321 EP - 324 ER - TY - JOUR A1 - Arthur, S. J. T1 - Wolf-Rayet nebulae and the wind-interstellar medium interaction JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - I review our current understanding of the interaction between a Wolf-Rayet star's fast wind and the surrounding medium, and discuss to what extent the predictions of numerical simulations coincide with multiwavelength observations of Wolf-Rayet nebulae. Through a series of examples, I illustrate how changing the input physics affects the results of the numerical simulations. Finally, I discuss how numerical simulations together with multiwavelength observations of these objects allow us to unpick the previous mass-loss history of massive stars. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88267 SP - 315 EP - 320 ER - TY - JOUR A1 - Russell, C. M. P. A1 - Corcoran, M. F. A1 - Cuadra, J. A1 - Owocki, S. P. A1 - Wang, Q. D. A1 - Hamaguchi, K. A1 - Sugawara, Y. A1 - Pollock, A. M. T. A1 - Kallman, T. R. T1 - Hydrodynamic and radiative transfer modeling of X-ray emission from colliding WR winds BT - WR 140 & the Galactic center JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Colliding Wolf-Rayet (WR) winds produce thermal X-ray emission widely observed by X-ray telescopes. In wide WR+O binaries, such as WR 140, the X-ray flux is tied to the orbital phase, and is a direct probe of the winds’ properties. In the Galactic center, ~30 WRs orbit the super massive black hole (SMBH) within ~10”, leading to a smorgasbord of wind-wind collisions. To model the X-ray emission of WR 140 and the Galactic center, we perform 3D hydrodynamic simulations to trace the complex gaseous flows, and then carry out 3D radiative transfer calculations to compute the variable X-ray spectra. The model WR 140 RXTE light curve matches the data well for all phases except the X-ray minimum associated with periastron, while the model spectra agree with the RXTE hardness ratio and the shape of the Suzaku observations throughout the orbit. The Galactic center model of the Chandra flux and spectral shape match well in the region r ≤ 3”, but the model flux falls off too rapidly beyond this radius. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88255 SP - 309 EP - 312 ER - TY - JOUR A1 - Gosset, E. T1 - Studies of WR+O colliding-wind binaries JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Two of the main physical parameters that govern the massive star evolution, the mass and the mass-loss rate, are still poorly determined from the observational point of view. Only binary systems could provide well constrained masses and colliding-wind binaries could bring some constraints on the mass-loss rate. Therefore, colliding-wind binaries turn out to be very promising objects. In this framework, we present detailed studies of basic observational data obtained with the XMM-Newton facility and combined with ground-based observations and other data. We expose the results for two particularly interesting WR+O colliding-wind binaries: WR22 and WR21a. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88247 SP - 305 EP - 308 ER - TY - JOUR A1 - Falceta-Goncalves, D. T1 - Magnetic fields, non-thermal radiation and particle acceleration in colliding winds of WR-O stars JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Non-thermal emission has been detected in WR-stars for many years at long wavelengths spectral range, in general attributed to synchrotron emission. Two key ingredients are needed to explain such emissions, namely magnetic fields and relativistic particles. Particles can be accelerated to relativistic speeds by Fermi processes at strong shocks. Therefore, strong synchrotron emission is usually attributed to WR binarity. The magnetic field may also be amplified at shocks, however the actual picture of the magnetic field geometry, intensity, and its role on the acceleration of particles at WR binary systems is still unclear. In this work we discuss the recent developments in MHD modelling of wind-wind collision regions by means of numerical simulations, and the coupled particle acceleration processes related. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88211 SP - 289 EP - 292 ER - TY - JOUR A1 - Mohamed, S. A1 - Mackey, J. A1 - Langer, N. A1 - Podsiadlowski, Philipp T1 - Shaping the outflows of Wolf-Rayet stars JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Wolf-Rayet (WR) stars lose copious amounts of mass and momentum through dense stellar winds. The interaction of these outflows with their surroundings results in highly structured and complex circumstellar environments, often featuring knots, arcs, shells and spirals. Recent improvements in computational power and techniques have led to the development of detailed, multi-dimensional simulations that have given new insight into the origin of these structures, and better understanding of the physical mechanisms driving their formation. We review three of the main mechanisms that shape the outflows of WR stars: • interaction with the interstellar medium (ISM), i.e., wind-ISM interactions; • interaction with a stellar wind, either from a previous phase of evolution or the wind from a companion star, i.e., wind-wind interactions; • and interaction with a companion star that has a weak or insignificant outflow (e.g., a compact companion such as a neutron star or black hole), i.e.,wind-companion interactions. We also highlight the broader implications and impact of these circumstellar structures for related phenomena, e.g., for X-ray binaries and Gamma-ray bursts. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88200 SP - 283 EP - 288 ER - TY - JOUR A1 - Hendrix, T. A1 - Keppens, R. T1 - Modelling colliding wind binaries in 2D JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - We look at how the dynamics of colliding wind binaries (CWB) can be investigated in 2D, and how several parameters influence the dynamics of the small scale structures inside the colliding wind and the shocked regions, as well as in how the dynamics influence the shape of the collision region at large distances. The parameters we adopt are based on the binary system WR98a, one of the few Wolf-Rayet (WR) dusty pinwheels known. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88198 SP - 279 EP - 282 ER - TY - JOUR A1 - Williams, P. M. A1 - van der Hucht, K. A. T1 - The colliding-wind WC9+OB system WR 65 and dust formation by WR stars JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Observations of the WC9+OB system WR65 in the infrared show variations of its dust emission consistent with a period near 4.8 yr, suggesting formation in a colliding-wind binary (CWB) having an elliptical orbit. If we adopt the IR maximum as zero phase, the times of X-ray maximum count and minimum extinction to the hard component measured by Oskinova & Hamann fall at phases 0.4–0.5, when the separation of the WC9 and OB stars is greatest. We consider WR65 in the context of other WC8–9+OB stars showing dust emission. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88188 SP - 275 EP - 278 ER - TY - JOUR A1 - Cherchneff, I. T1 - Dust formation in carbon-rich Wolf-Rayet colliding winds JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Carbon-rich Wolf-Rayet stars are efficient carbon dust makers. Despite the strong evidence for dust formation in these objects provided by infrared thermal emission from dust, the routes to nucleation and condensation and the physical conditions required for dust production are still poorly understood. We discuss here the potential routes to carbon dust and the possible locations conducive to dust formation in the colliding winds of WC binaries. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88177 SP - 269 EP - 274 ER - TY - JOUR A1 - Guerrero, Martín A. T1 - Planetary nebulae and Their Central Stars in X-rays JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Two types of X-ray sources are mostly found in planetary nebulae (PNe): point sources at their central stars and diffuse emission inside hot bubbles. Here we describe these two types of sources based on the most recent observations obtained in the framework of the Chandra Planetary Nebula Survey, ChanPlaNS, an X-ray survey targeting a volume-limited sample of PNe. Diffuse X-ray emission is found preferentially in young PNe with sharp, closed inner shells. Point sources of X-ray emission at the central stars reveal magnetically active binary companions and shock-in stellar winds. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88160 SP - 263 EP - 266 ER -