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DEPENDENCE OF s -PROCESS NUCLEOSYNTHESIS IN MASSIVE STARS ON TRIPLE-ALPHA AND 12 C(α, γ) 16 O REACTION RATE UNCERTAINTIES

2009; IOP Publishing; Volume: 702; Issue: 2 Linguagem: Inglês

10.1088/0004-637x/702/2/1068

ISSN

1538-4357

Autores

C. Tur, Alexander Heger, Sam M. Austin,

Tópico(s)

Astro and Planetary Science

Resumo

We have studied the sensitivity of s-process nucleosynthesis in massive stars to +/- 2 sigma variations in the rates of the triple alpha and 12C(a,g)16O reactions. We simulated the evolution of massive stars from H-burning through Fe-core collapse, followed by a supernova explosion. We found that: the production factors of s-process nuclides between 58Fe and 96Zr change strongly with changes in the He burning reaction rates; using the Lodders (2003) solar abundances rather than those of Anders and Grevesse (1989) reduces s-process nucleosynthesis; later burning phases beyond core He burning and the shell C burning have a significant effect on post-explosive production factors. We also discuss the implications of the uncertainties in the helium burning rates for evidence of a new primary neutron capture process (LEPP) in massive stars.

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