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Spectroscopy of complete populations of Wolf-Rayet binaries in the Magellanic Clouds

Published online by Cambridge University Press:  30 December 2019

Tomer Shenar Open the ORCID record for Tomer Shenar [Opens in a new window] ,
R. Hainich ,
W.-R. Hamann ,
A. F. J. Moffat ,
H. Todt ,
A. Sander Open the ORCID record for A. Sander [Opens in a new window] ,
L. M. Oskinova ,
H. Sana ,
O. Schnurr  and
N. St-Louis
Tomer Shenar
Affiliation:
Institute of Astrophysics, KU Leuven, Celestijnenlaan 200 D, 3001, Leuven, Belgium email: [email protected]
R. Hainich
Affiliation:
Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Str. 24/25, D-14476 Potsdam, Germany
W.-R. Hamann
Affiliation:
Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Str. 24/25, D-14476 Potsdam, Germany
A. F. J. Moffat
Affiliation:
Département de physique and Centre de Recherche en Astrophysique du Québec (CRAQ), Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec, H3C 3J7, Canada
H. Todt
Affiliation:
Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Str. 24/25, D-14476 Potsdam, Germany
A. Sander
Affiliation:
Armagh Observatory and Planetarium, College Hill, Armagh, BT61 9DG, UK
L. M. Oskinova
Affiliation:
Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Str. 24/25, D-14476 Potsdam, Germany
H. Sana
Affiliation:
Institute of Astrophysics, KU Leuven, Celestijnenlaan 200 D, 3001, Leuven, Belgium email: [email protected]
O. Schnurr
Affiliation:
Leibniz-Institut für Astrophysik Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
N. St-Louis
Affiliation:
Département de physique and Centre de Recherche en Astrophysique du Québec (CRAQ), Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec, H3C 3J7, Canada
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Abstract

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Classical Wolf-Rayet stars are evolved, hydrogen depleted massive stars that exhibit strong mass-loss. In theory, these stars can form either by intrinsic mass loss (stellar winds or eruptions), or via mass-removal in binaries. The Wolf-Rayet stars in the Magellanic Clouds are often thought to have originated through binary interaction due to the low ambient metallicity and, correspondingly, reduced wind mass-loss. We performed a complete spectral analysis of all known WR binaries of the nitrogen sequence in the Small and Large Magellanic Clouds, as well as additional orbital analyses, and constrained the evolutionary histories of these stars. We find that the bulk of Wolf-Rayet stars are luminous enough to be explained by single-star evolution. In contrast to prediction, we do not find clear evidence for a large population of low-luminosity Wolf-Rayet stars that could only form via binary interaction, suggesting a discrepancy between predictions and observations.

Keywords

stars: Wolf-Rayetbinaries: spectroscopicMagellanic Cloudsstars: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S346: High-mass X-ray Binaries: Illuminating the Passage from Massive Binaries to Merging Compact Objects , August 2018 , pp. 307 - 315
Copyright
© International Astronomical Union 2019 

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