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| Paper: |
S-process Nucleosynthesis in SAGB Stars |
| Volume: |
445, Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants |
| Page: |
45 |
| Authors: |
Lau, H. H. B.; Doherty, C. L.; Gil-Pons, P.; Lattanzio, J. C. |
| Abstract: |
Super asymptotic giant branch (SAGB) stars, in a mass range between
5 and 11 M☉, have a similar evolution to high-mass AGB stars
but are hot enough to ignite carbon in their cores non-degenerately
during the early AGB phase. However, they could have a different
nucleosynthesis signature because of the higher temperature at the
bottom of intershell convective zone. In particular, 22Ne
is the major source of neutrons. We have used the new Monash
nucleosynthesis code MONTAGE to compute yields of 475
different isotopes, including s-process elements. We find
22Ne is the major source of neutrons and the
13C contribution is not significant. Moreover, the
reaction rate of the triple-alpha reaction and
12C(α,γ)16O is critical to determine
the nucleosynthesis of SAGB stars, particularly the heavy s-process
isotopes and Pb. |
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