Massive Stars as Cosmic Engines Through the Ages

  title={Massive Stars as Cosmic Engines Through the Ages},
  author={Andr{\'e} Maeder and Georges Meynet and Sylvia Ekstr{\"o}m and Raphael Hirschi and Cyril Georgy},
Some useful developments in the model physics are briefly presented, followed by model results on chemical enrichments and WR stars. We discuss the expected rotation velocities of WR stars. We emphasize that the (C+O)/He ratio is a better chemical indicator of evolution for WC stars than the C/He ratios. With or without rotation, at a given luminosity the (C+O)/He ratios should be higher in regions of lower metallicity Z . Also, for a given (C+O)/He ratio the WC stars in lower Z regions have… CONTINUE READING

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