Nucleosynthesis in the Early Galaxy

Details Nucleosynthesis in the Early Galaxy Nucleosynthesis in the Early Galaxy

2007-09-04

arxiv.org/abs/0709.0417v1

Astronomy and Astrophysics

Astrophysics

28 pages, 7 Postscript figures. To be published in The Astrophysical Journal

Scientific paper

10.1086/523084

Recent observations of r-process-enriched metal-poor star abundances reveal a non-uniform abundance pattern for elements $Z\leq47$. Based on non-correlation trends between elemental abundances as a function of Eu-richness in a large sample of metal-poor stars, it is shown that the mixing of a consistent and robust light element primary process (LEPP) and the r-process pattern found in r-II metal-poor stars explains such apparent non-uniformity. Furthermore, we derive the abundance pattern of the LEPP from observation and show that it is consistent with a missing component in the solar abundances when using a recent s-process model. As the astrophysical site of the LEPP is not known, we explore the possibility of a neutron capture process within a site-independent approach. It is suggested that scenarios with neutron densities $n_{n}\leq10^{13}$ $cm^{-3}$ or in the range $n_{n}\geq10^{24}$ $cm^{-3}$ best explain the observations.

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