We present evolutionary models of zero-metallicity (Pop-III) very massive objects (VMOs) , with initial masses in the range 120 Msun - 1000 Msun. In the attempt of exploring the possible occurrence of mass loss by stellar winds, calculations are carried out with suitable formalisms for the mass-loss rates driven by radiation pressure and stellar rotation. The corresponding wind chemical yields are presented. Finally, with the aid of a simple chemical model, the primordial helium and metal enrichments, and the resulting Delta Y/Delta Z ratio are discussed.
Evolution and nucleosynthesis of primordial very massive stars
MARIGO, PAOLA;CHIOSI, CESARE
2003
Abstract
We present evolutionary models of zero-metallicity (Pop-III) very massive objects (VMOs) , with initial masses in the range 120 Msun - 1000 Msun. In the attempt of exploring the possible occurrence of mass loss by stellar winds, calculations are carried out with suitable formalisms for the mass-loss rates driven by radiation pressure and stellar rotation. The corresponding wind chemical yields are presented. Finally, with the aid of a simple chemical model, the primordial helium and metal enrichments, and the resulting Delta Y/Delta Z ratio are discussed.
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