Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....88..230v&link_type=abstract
Astronomy and Astrophysics, vol. 88, no. 1-2, Aug. 1980, p. 230-239. NSF-supported research.
Astronomy and Astrophysics
Astrophysics
64
Binary Stars, Frequency Distribution, Hot Stars, Magellanic Clouds, Milky Way Galaxy, Stellar Evolution, Wolf-Rayet Stars, Absorption Spectra, Chemical Composition, Helium, Line Spectra, Stellar Luminosity, Stellar Mass Ejection, Stellar Temperature, Stellar Winds
Scientific paper
The frequency distribution of Wolf-Rayet (WR) stars in binary systems and the evolution of Wolf-Rayet stars are discussed. Following a brief review of the chemical composition and effective temperatures of WR stars, observations of absorption lines indicating the probable presence of OB companions to less than 40% of the galactic and LMC WR stars but to all eight of the SMC WR stars are presented. It is suggested that a substantial fraction of WR stars without OB companions could have compact companions, but that some WR stars are truly single. The distributions of the various types of WR stars in the Galaxy and the Magellanic Clouds are compared in order to investigate the lifetimes of the WNL, WNE and WC subgroups. It is argued that WNE and WC stars can not be at the end of core H burning as stellar wind mass loss would not be sufficient for this stage, and evolutionary computations with mass loss by stellar winds are presented for the transition from WNL to WNE based on new effective temperature determinations. It is thus found that the He ZAMS can be situated at much lower effective temperatures than the hydrogen ZAMS.
Conti Peter S.
Vanbeveren Dany
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