S-process in hot AGB stars: A complex interplay between diffusive mixing and nuclear burning

Details S-process in hot AGB stars: A complex interplay between diffusive mixing and nuclear burning S-process in hot AGB stars: A complex interplay between diffusive mixing and nuclear burning

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...421l..25g&link_type=abstract

Astronomy and Astrophysics, v.421, p.L25-L28 (2004)

Astronomy and Astrophysics

Astrophysics

32

Nucleosynthesis, S-Process, Agb Stars

Scientific paper

We present new qualitative results of the s-process nucleosynthesis in hot AGB stars resulting from diffusive convective overshooting. In this approach, protons from the convective envelope are injected into the adjacent 12C-rich layers, but depending on the thermodynamic conditions in the mixing zone, the nuclear proton lifetime can be comparable with (or even smaller than) the diffusion timescale. In such a case, the nucleosynthesis and diffusion equations must be coupled. Our simulations indicate that during this diffusive burning phase, the 14N-rich and 13C-rich layers overlap with drastic impact on the s-process distribution. Our study emphasizes the sensitivity of the s-process nucleosynthesis on the temperature of the partial mixing zone. We show that in this framework, a deep hot third dredge-up tends to inhibit the production of s-elements. We also provide a first qualitative estimate of the metallicity and mass dependence of the s-process efficiency in AGB stars and propose that this complex interplay could account for the large variety of the observed s-process efficiencies.

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