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Evolution of Rotating AGB Stars and the s-Process Nucleosynthesis

Published online by Cambridge University Press:  05 March 2013

Lionel Siess ,
Stéphane Goriely  and
Norbert Langer
Lionel Siess*
Affiliation:
Institut d'Astronomie et d'Astrophysique, Université Libre de Bruxelles, CP 226, B-1050 Brussels, Belgium
Stéphane Goriely
Affiliation:
Institut d'Astronomie et d'Astrophysique, Université Libre de Bruxelles, CP 226, B-1050 Brussels, Belgium
Norbert Langer
Affiliation:
Astronomical Institute, Universiteit Utrecht, P.O. Box 80000, NL-3508 TA Utrecht, The Netherlands
*
siess@astro.ulb.ac.be
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Abstract

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We present new results on the evolution and nucleosynthesis in rotating AGB stars. We analyse the role of the gradient of mean molecular weight in the mixing process and show that neglecting this component induces a potentially strong third dredge-up. We also quantify the impact of rotation on the structure and conclude that the effects of rotation (1) mainly concern the inner, fast rotating regions of the stars and (2) are relatively weak as long as rotational mixing does not induce a deep third dredge-up. We also focus our investigations on the s-process nucleosynthesis and show that rotational mixing tends to inhibit the production of s-elements. This results from the contamination of the 13C-rich layers responsible for the neutron production by the poisonous 14N. Our calculations also indicate that the distribution of s-process elements depends sensitively on the magnitude of the diffusion coefficient. These results suggest that rotational mixing is not the main mechanism responsible for the production of s-elements in AGB stars, but that it can influence, and in particular reduce, the final enrichment in s-elements.

Keywords

stars: AGB and post-AGBstars: rotationnuclear reactions, nucleosynthesis, abundances
Type
Sixth Torino Workshop
Information
Publications of the Astronomical Society of Australia , Volume 20 , Issue 4 , 2003 , pp. 371 - 377
Copyright
Copyright © Astronomical Society of Australia 2003

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