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The 13C Pocket in Low-Mass AGB Stars

Published online by Cambridge University Press:  05 March 2013

O. Straniero ,
S. Cristallo  and
R. Gallino
O. Straniero*
Affiliation:
INAF-Osservatorio Astronomico di Teramo, Via Mentore Maggini s.n.c., 64100 Teramo, Italy
S. Cristallo
Affiliation:
INAF-Osservatorio Astronomico di Teramo, Via Mentore Maggini s.n.c., 64100 Teramo, Italy
R. Gallino
Affiliation:
Dipartimento di Fisica Generale, Universitá di Torino, Via P. Giuria 1, 10125 Torino, Italy
*
CCorresponding author. Email: [email protected]
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Abstract

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It is well known that thermally pulsing Asymptotic Giant Branch stars with low mass play a relevant role in the chemical evolution. They have synthesized about 30% of the galactic carbon and provide an important contribution to the nucleosynthesis of heavy elements (A > 80). The relevant nucleosynthesis site is the He-rich intermediate zone (less than 10−2 M⊙), where α(2α,γ)12C reactions and slow neutron captures on seed nuclei (essentially iron) take place. A key ingredient is the interplay between nuclear processes and convective mixing. It is the partial overlap of internal and external convective zones that allows the dredge-up of the material enriched in C and heavy elements. We review the progresses made in the last 50 years in the comprehension of the s process in AGB stars, with special attention to the identification of the main neutron sources and to the particular physical conditions allowing this important nucleosynthesis.

Keywords

nuclear reactions, nucleosynthesis, abundancesstars: AGB and post-AGB
Type
Theory, Evolution and Models
Information
Publications of the Astronomical Society of Australia , Volume 26 , Issue 3 , 2009 , pp. 133 - 138
Copyright
Copyright © Astronomical Society of Australia 2009

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