Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sf2a.conf..299r&link_type=abstract
SF2A-2006: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: D. Barret, F. Casoli, G.
Astronomy and Astrophysics
Astrophysics
Scientific paper
We calculate the evolution of 6Li generated from cosmic rays produced by an early population of massive stars. The computation is performed in the framework of hierarchical structure formation and is based on cosmic star formation histories constrained to reproduce the observed star formation rate at redshift z ≤ 6, to reproduce the observed chemical abundances in damped Lyman alpha absorbers and in the intergalactic medium, and to allow for an early reionization of the Universe
at z˜ 11 by Population III stars as indicated by the third year results released by WMAP. We show that the pregalactic production of the 6Li
isotope in the InterGalactic Medium (IGM) via these Population III stars can account for the 6Li
plateau observed in metal poor halo stars without additional over-production of 7Li. Our results depend on the efficiency of cosmic rays to propagate out of
minihalos and the fraction of supernovae energy deposited in cosmic rays.
Olive Keith
Rollinde Emmanuel
Vangioni Elisabeth
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