Population synthesis of s-process element enhanced stars: Constraining the 13C efficiency

2006/03/28 by Marinovic, A. Bonacic, Izzard, R. G., Lugaro, M. +1
#Astrophysics (astro-ph) #FOS: Physical sciences

paper · doi:10.48550/arxiv.astro-ph/0603757

Abstract

We study s-process element abundance ratios in stars by carrying out stellar population synthesis, using a rapid synthetic stellar evolution code which includes an up-to-date treatment of AGB nucleosynthesis and evolution. In contrast to other studies, we find that a large spread in the 13C efficiency parameter (13C_eff) is not needed to explain the observed spread in the ratios of heavy s-process to light s-process elements ([hs/ls]), but this comes naturally from the range of different initial stellar masses and their time evolution. As a result, the 13C efficiency needed for fitting most stars in the galactic disk is constrained to 1 < 13C_eff < 2.5. In the same fashion we also study the [Pb/Ce] ratios of lead stars and find out that for low metallicities 13C_eff is approximately 0.5.

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