Very Massive Stars and their Cosmological Consequences

Details Very Massive Stars and their Cosmological Consequences Very Massive Stars and their Cosmological Consequences

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..758..153k&link_type=abstract

GRAVITATION AND COSMOLOGY: 2nd Mexican Meeting on Mathematical and Experimental Physics. AIP Conference Proceedings, Volume 758

Physics

3

Supernovae, Cosmology, Star Formation, Stellar Mass, Supernovae, Cosmology, Star Formation, Masses

Scientific paper

In recent years there has been increasing interest in understanding the role that Very Massive Stars (VMS) could play in the cosmological scenario. Star formation and accretion calculations suggest that the proposed first stars are VMS rather than lower mass stars. However, recent nucleosynthesis results of very massive supernovae (SN) explosions suggest that the so called strong VMS hypothesis is inconsistent with data from Extremely Metal Poor (EMP) stars and that the observations are better explained by energetic supernovae or hypernovae connected to low redshift gamma-ray bursts. We propose an alternative scenario where the first stars are born very massive but their mass reduced to the Massive Star (MS) range during their quasi-static hydrogen and helium burning phases. In this work we present Zero Age Main Sequence (ZAMS) models and evolutionary calculations of mass losing VMS and show that for high enough mass loss rates, the mass is reduced to the MS range. Our results also show that, if as predicted by reionization models, a fraction of ~ 10-3 of the baryons in the Universe is incorporated into VMS first stars, the amount of CNO elements returned to the interstellar medium through radiation driven winds is consistent with observations of EMP stars.

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