Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...415.1089s&link_type=abstract
Astronomy and Astrophysics, v.415, p.1089-1097 (2004)
Astronomy and Astrophysics
Astrophysics
41
Nucleosynthesis, Stars: Agb And Post-Agb, Nuclear Reactions, Abundances
Scientific paper
We analyze the s-process nucleosynthesis in models of rotating AGB stars, using a complete nuclear network covering nuclei up to Polonium. During the stage of thermal pulses, the extreme shear field that develops at the base of the convective envelope leads to the injection of protons into the adjacent 12C-rich core. Subsequent proton captures lead to overlapping 14N-rich and 13C-rich layers. While the 13C nuclei release neutrons due to α- captures during the interpulse phase, the persistence of mixing due to differential rotation produces a contamination of the whole 13C-rich layer with 14N. The result is a quenching of the s-process efficiency. Our study emphasizes the sensitivity of the s-process nucleosynthesis to the strength and duration of the shear mixing phase. Uncertainties in the rate of 13C(α,n) turn out to have small effects on the resultant distribution of s-elements. Finally, we show that in this framework, a deeper third dredge-up tends to further inhibit the production of s-elements.
Goriely Stephane
Langer Norbert
Siess Lionel
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