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Physical processes in stellar evolution

  • André Maeder
Invited Reviews
Part of the Lecture Notes in Physics book series (LNP, volume 458)

Abstract

We firstly examine the possible roles of mass loss and mixing as a function of stellar masses. Then we review the present observational status about additional mixing processes in massive stars. Various evidences from main-sequence OB stars, from blue supergiants, from SN 1987A and from Wolf-Rayet stars are given in favour of a significant mixing in radiative zones of rapidly rotating massive stars. We also particularly examine the role of mass loss on the ratio Δ Y/Δ Z of the relative helium-to-metal enrichments. We show that mass loss is far from sufficient to explain the high observed δ Y/ Δ Z ratios. We suggest that swallowing of heavy elements in black holes occurs. In order to account for the observed Δ Y/Δ Z ratios in low Z HII regions, it is necessary that black holes form above initial masses of about 20 {ie5-1}.

Keywords

Black Hole Mass Loss Neutron Star Mass Loss Rate Stellar Mass 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  • André Maeder
    • 1
  1. 1.Geneva ObservatorySauvernySwitzerland

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