TY  - GEN
A1  - Martins, Fabrice
A1  - Bergemann, Maria
A1  - Bestenlehner, Joachim M.
A1  - Crowther, Paul A.
A1  - Hamann, Wolf-Rainer
A1  - Najarro, Francisco
A1  - Nieva, Maria Fernanda
A1  - Przybilla, Norbert
A1  - Freimanis, Juris
A1  - Hou, Weizhen
A1  - Kaper, Lex
T1  - SpS5 - II. Stellar and wind parameters
T2  - Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
N2  - The development of infrared observational facilities has revealed a number of massive stars in obscured environments throughout the Milky Way and beyond. The determination of their stellar and wind properties from infrared diagnostics is thus required to take full advantage of the wealth of observations available in the near and mid infrared. However, the task is challenging. This session addressed some of the problems encountered and showed the limitations and successes of infrared studies of massive stars.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 688 
KW  - infrared: stars
KW  - stars: early-type
KW  - stars: late-type
KW  - stars: fundamental parameters
KW  - stars: mass loss
KW  - stars: abundances
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-414956
SN  - 1866-8372
IS  - 688
ER  - 
TY  - GEN
A1  - Oskinova, Lida
A1  - Feldmeier, Achim
A1  - Kretschmar, Peter
T1  - Clumped stellar winds in supergiant high-mass X-ray binaries
T2  - Postprint der universität Potsdam : Mathematisch Naturwissenschaftliche Reihe
N2  - The clumping of massive star winds is an established paradigm, which is confirmed by multiple lines of evidence and is supported by stellar wind theory. We use the results from time-dependent hydrodynamical models of the instability in the line-driven wind of a massive supergiant star to derive the time-dependent accretion rate on to a compact object in the Bondi-Hoyle-Lyttleton approximation. The strong density and velocity fluctuations in the wind result in strong variability of the synthetic X-ray light curves. Photoionization of inhomogeneous winds is different from the photoinization of smooth winds. The degree of ionization is affected by the wind clumping. The wind clumping must also be taken into account when comparing the observed and model spectra of the photoionized stellar wind.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 573 
KW  - accretion
KW  - instabilities
KW  - stars: mass loss
KW  - X-rays: binaries
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-413916
SN  - 1866-8372
IS  - 573
SP  - 287
EP  - 288
ER  -