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

• Autoři: KRTIČKA Jiří; OWOCKI Stanley P.; KUBÁT Jiří; GALLOWAY Ross K.; BROWN John C.
• Rok publikování: 2003
• Druh: Článek v odborném periodiku
• Časopis / Zdroj: Astronomy and Astrophysics
• Fakulta / Pracoviště MU: Přírodovědecká fakulta
• www: http://www.edpsciences.org/articles/aa/abs/2003/17/aah4143/aah4143.html
• Obor: Astronomie a nebeská mechanika, astrofyzika
• Klíčová slova: stars: mass-loss -- stars: early-type -- stars:abundances -- stars: winds; outflows
• Popis: 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.

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• Fyzika horkých hvězd a hvězdných systémů s horkými složkami