The WR population predicted by massive single star and by massive binary evolution

Details The WR population predicted by massive single star and by massive binary evolution The WR population predicted by massive single star and by massive binary evolution

2007-03-30

arxiv.org/abs/astro-ph/0703796v1

Astronomy and Astrophysics

Astrophysics

13 pages, 4 figures; comments and criticisms on this preprint are very welcome

Scientific paper

10.1086/519454

We discuss differences between massive single star and massive close binary population number synthesis predictions of WR stars. We show that the WC/WN number ratio as function of metallicity depends significantly on whether or not binaries are included. Furthermore, the observed WC(+OB)/WN(+OB) number ratio in the Solar neighborhood seems to indicate that the WR mass loss rates are lower by another factor two compared to recently proposed clumping corrected formalisms. We then demonstrate that the observed lower luminosity distribution of single WN stars can be explained in a satisfactory way by massive single star evolutionary computations where the red supergiant phase is calculated using a stellar wind mass loss rate formalism that is based on recent observations.

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