Two evolved close binary stars: GALEX J015054.4+310745 and the central star of the planetary nebula Hen 2-84
- As part of a survey to find close binary systems among central stars of planetary nebula, we present two newly discovered binary systems. GALEX J015054.4+310745 is identified as the central star of the possible planetary nebula Fr 2-22. We find it to be a single-lined spectroscopic binary with an orbital period of 0.2554435(10) d. We support the previous identification of GALEX J015054.4+310745 as an sdB star and provide physical parameters for the star from spectral modelling. We identify its undetected companion as a likely He white dwarf. Based on this information, we find it unlikely that Fr 2-22 is a true planetary nebula. In addition, the central star of the true planetary nebula Hen 2-84 is found to be a photometric variable, likely due to the irradiation of a cool companion. The system has an orbital period of 0.485645(30) d. We discuss limits on binary parameters based on the available light-curve data. Hen 2-84 is a strongly shaped bipolar planetary nebula, which we now add to the growing list of axially orAs part of a survey to find close binary systems among central stars of planetary nebula, we present two newly discovered binary systems. GALEX J015054.4+310745 is identified as the central star of the possible planetary nebula Fr 2-22. We find it to be a single-lined spectroscopic binary with an orbital period of 0.2554435(10) d. We support the previous identification of GALEX J015054.4+310745 as an sdB star and provide physical parameters for the star from spectral modelling. We identify its undetected companion as a likely He white dwarf. Based on this information, we find it unlikely that Fr 2-22 is a true planetary nebula. In addition, the central star of the true planetary nebula Hen 2-84 is found to be a photometric variable, likely due to the irradiation of a cool companion. The system has an orbital period of 0.485645(30) d. We discuss limits on binary parameters based on the available light-curve data. Hen 2-84 is a strongly shaped bipolar planetary nebula, which we now add to the growing list of axially or point-symmetric planetary nebulae with a close binary central star.…
Verfasserangaben: | Todd C. Hillwig, Nicole ReindlORCiDGND, Hannah M. Rotter, Adam W. Rengstorf, Ulrich HeberORCiDGND, Andreas IrrgangORCiD |
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DOI: | https://doi.org/10.1093/mnras/stac226 |
ISSN: | 0035-8711 |
ISSN: | 1365-2966 |
Titel des übergeordneten Werks (Englisch): | Monthly notices of the Royal Astronomical Society |
Verlag: | Oxford Univ. Press |
Verlagsort: | Oxford |
Publikationstyp: | Wissenschaftlicher Artikel |
Sprache: | Englisch |
Datum der Erstveröffentlichung: | 29.01.2022 |
Erscheinungsjahr: | 2022 |
Datum der Freischaltung: | 05.04.2024 |
Freies Schlagwort / Tag: | binaries: close; planetary nebulae: individual: Hen 2-84; stars: individual: GALEX J015054.4+310745; subdwarfs |
Band: | 511 |
Ausgabe: | 2 |
Seitenanzahl: | 7 |
Erste Seite: | 2033 |
Letzte Seite: | 2039 |
Fördernde Institution: | Indiana Space Grant Consortium; ESO Telescopes at the La Silla or; Paranal Observatories [177.D-3023(B), 177.D-3023(C), 177.D-3023(D),; 177.D-3023(E)]; National Development and Reform Commission |
Organisationseinheiten: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
DDC-Klassifikation: | 5 Naturwissenschaften und Mathematik / 52 Astronomie / 520 Astronomie und zugeordnete Wissenschaften |
Peer Review: | Referiert |
Lizenz (Deutsch): | Keine öffentliche Lizenz: Unter Urheberrechtsschutz |