期刊
ASTROPHYSICAL JOURNAL
卷 662, 期 2, 页码 L107-L110出版社
IOP PUBLISHING LTD
DOI: 10.1086/519454
关键词
stars : evolution; stars : mass loss; stars : Wolf-Rayet
We discuss the 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 2 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, in which the red supergiant phase is calculated using a stellar wind mass-loss rate formalism that is based on recent observations.
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