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Astronomy & Astrophysics manuscript no. (will be inserted by hand later) Nucleosynthesis of s-elements in zero-metal AGB stars

By S. Goriely and L. Siess

Abstract

Received date; accepted date Abstract. Contrary to previous expectations, recent evolutionary models of zero-metallicity stars show that the development of mixing episodes at the beginning of the AGB phase allows low- and intermediate-mass stars to experience thermal pulses. If these stars, like their metal-rich counterparts, also experience partial mixing of protons from the H-rich envelope into the C-rich layers at the time of the third dredge-up, an extensive neutron capture nucleosynthesis leads to the production of s-process nuclei up to Pb and Bi. Nucleosynthesis calculations based on stellar AGB models are performed assuming a parameterized H-abundance profile below the convective envelope at the time of the third dredge-up. Despite the absence of Fe-group elements, the large neutron flux resulting from the 13 C(α,n) 16 O reaction leads to an efficient production of s-process elements starting from the neutron captures on the C-Ne isotopes. Provided partial mixing of protons takes place, it is shown that population III AGB stars should be enriched in s-process elements and overall in Pb and Bi

Topics: Key words. nucleosynthesis, Stars, AGB, abundances
Year: 2001
OAI identifier: oai:CiteSeerX.psu:10.1.1.317.3624
Provided by: CiteSeerX
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