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The Close Binary Frequency of Wolf-Rayet Stars as a Function of Metallicity in M31 and M33

Published online by Cambridge University Press:  23 January 2015

Kathryn F. Neugent  and
Philip Massey
Kathryn F. Neugent
Affiliation:
Lowell Observatory emails: [email protected], [email protected]
Philip Massey
Affiliation:
Lowell Observatory emails: [email protected], [email protected]
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Abstract

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Here we investigate whether the inability of the Geneva evolutionary models to predict a large enough WC/WN ratio at high metallicities (while succeeding at lower metallicities) is due to their single star nature. We hypothesize that Roche-lobe overflow in close binary systems may produce a greater number of WC stars at higher metallicities. But, this would suggest that the frequency of close massive binaries is metallicity dependent. We now present our results based on observations of ~100 Wolf-Rayet binaries in the varying metallicity environments of M31 and M33.

Keywords

stars: Wolf-Rayetbinaries: closestars: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Issue S307: New windows on massive stars: asteroseismology, interferometry, and spectropolarimetry , June 2014 , pp. 127 - 128
Copyright
Copyright © International Astronomical Union 2015 

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