On multicomponent effects in stellar winds of stars at extremely low metallicity

Abstract

We calculate multicomponent line-driven wind models of stars at extremely low metallicity suitable for massive first generation stars. For most of the models we find that the multicomponent wind nature is not important for either wind dynamics or for wind temperature stratification. However, for stars with the lowest metallicities we find that multicomponent effects influence the wind structure. These effects range from pure heating to possible fallback of the nonabsorbing wind component. We present a simple formula for the calculation of metallicity for which the multicomponent effects become important. We show that the importance of the multicomponent nature of winds of low metallicity stars is characterised not only by the low density of driving ions, but also by lower mass-loss rate.

6 pages, 8 figures. Accepted for publication in Astronomy & Astrophysics

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• The winds of the hot massive first stars
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• NLTE models of line-driven stellar winds I. Method of calculation and first results for O stars
• Metal abundances in hot white dwarfs with signatures of a superionized wind
• Mass-loss rates of Very Massive Stars
• Spherically symmetric NLTE model atmospheres of hot hydrogen-helium first stars