Population synthesis of s-process element enhanced stars: Constraining the 13C efficiency
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. In the same fashion we also study the [Pb/Ce] ratios of lead stars and find out that for low metallicities 13C_eff∼ 0.5.
- Publication:
-
Memorie della Societa Astronomica Italiana
- Pub Date:
- 2006
- DOI:
- 10.48550/arXiv.astro-ph/0603757
- arXiv:
- arXiv:astro-ph/0603757
- Bibcode:
- 2006MmSAI..77..879B
- Keywords:
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- Astrophysics
- E-Print:
- 6 pages, 3 figures, 1 .cls file (mem.cls) Proceeding of the 8th Torino Workshop in Granada, February, 2006