出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：Big Bang nucleosynthesis produces only light elements and the very first generation stars are thus
formed from metal-free clouds. They start the production of heavy elements during their life,
and enrich the interstellar medium through their explosive death. Stellar evolution models show
that the treatment of rotation has important effects on the evolution of those metal-free stars: for
example, rotating models produce up to five orders of magnitude more primary nitrogen than
non rotating models, due to internal mixing. This will have an impact in the composition of the
second generation stars, some of which may now be observed in the Galactic halo. In the case
Population III stars were very massive and would end up as direct black holes, rotation again have
an interesting effect of enhancing mass loss through centrifugal force and surface enrichment.
CNO composition patterns observed in ultra metal-poor halo stars may be explained by a ’wind
only’ contribution.
