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A new prescription for the mass-loss rates of hydrogen-free WR stars

Published online by Cambridge University Press:  28 July 2017

Frank Tramper ,
Hugues Sana  and
Alex de Koter
Frank Tramper
Affiliation:
European Space Astronomy Centre (ESA/ESAC), Operations Department, Villanueva de la Cañada (Madrid), Spain email: [email protected]
Hugues Sana
Affiliation:
Institute of Astrophysics, KU Leuven, Celestijnenlaan 200 D, B-3001, Leuven, Belgium
Alex de Koter
Affiliation:
Institute of Astrophysics, KU Leuven, Celestijnenlaan 200 D, B-3001, Leuven, Belgium Anton Pannekoek Institute for Astronomy, University of Amsterdam, P.O. Box 94249, 1090 GE Amsterdam, The Netherlands
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Abstract

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We present a new empirical prescription for the mass-loss rates of hydrogen-free Wolf-Rayet stars based on results of detailed spectral analyses of WC and WO stars. Compared to the prescription of Nugis & Lamers (2000), Ṁ is less sensitive to the surface helium abundance, implying a stronger mass loss at the late stages of Wolf-Rayet evolution. The winds of hydrogen-free WN stars have a strong metallicity dependence, while those of WC and WO stars have a very weak metallicity dependence.

Keywords

stars: Wolf-Rayetstars: mass lossstars: windsoutflows
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S329: The Lives and Death-Throes of Massive Stars , November 2016 , pp. 452
Copyright
Copyright © International Astronomical Union 2017 

References

Nugis, T. & Lamers, H. J. G. L. M. 2000, A&A, 360, 227 Google Scholar
Tramper, F., Straal, S. M., Sanyal, D., et al., 2015, A&A, 581, 110 Google Scholar
Tramper, F., Sana, H., de Koter, A., 2016, ApJ, 833, 133 CrossRefGoogle Scholar