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Wolf-Rayet Wind Models from Hydrodynamic Model Atmospheres

Published online by Cambridge University Press:  01 December 2007

Götz Gräfener  and
Wolf-Rainer Hamann
Götz Gräfener
Affiliation:
Institut für Physik, Universität Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany
Wolf-Rainer Hamann
Affiliation:
Institut für Physik, Universität Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany
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Abstract

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We present a parameter study of WR-type mass loss, based on the PoWR hydrodynamic model atmospheres. These new models imply that optically thick WR-type winds are generally formed close to the Eddington limit. This is demonstrated for the case of hydrogen rich WNL stars, which turn out to be extremely massive, luminous stars with progenitor masses above ≈ 80 M⊙. We investigate the dependence of WR-type mass loss on various stellar parameters, including the metallicity Z. The results depend strongly on the L/M ratio, the stellar temperature T*, and the assumed wind clumping. For high L/M ratios, strong WR-type winds can be maintained down to very low Z. Even for primordial massive stars we predict considerable mass loss if their surfaces are self-enriched by primary elements.

Keywords

stars: abundances – stars: atmospheres – stars: mass loss – stars: Wolf-Rayet
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S250: Massive Stars as Cosmic Engines , December 2007 , pp. 63 - 70
Copyright
Copyright © International Astronomical Union 2008

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