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Nucleosynthesis of Light-Element Isotopes in Evolved Stars Experiencing Extended Mixing

Published online by Cambridge University Press:  05 March 2013

S. Palmerini ,
M. Busso ,
E. Maiorca  and
R. Guandalini
S. Palmerini*
Affiliation:
Dipartimento di Fisica, Università degli Studi di Perugia, via Pascoli, 06123 Perugia, Italy INFN Sezione di Perugia, via Pascoli, 06123 Perugia, Italy
M. Busso
Affiliation:
Dipartimento di Fisica, Università degli Studi di Perugia, via Pascoli, 06123 Perugia, Italy INFN Sezione di Perugia, via Pascoli, 06123 Perugia, Italy
E. Maiorca
Affiliation:
Dipartimento di Fisica, Università degli Studi di Perugia, via Pascoli, 06123 Perugia, Italy INFN Sezione di Perugia, via Pascoli, 06123 Perugia, Italy
R. Guandalini
Affiliation:
Dipartimento di Fisica, Università degli Studi di Perugia, via Pascoli, 06123 Perugia, Italy INFN Sezione di Perugia, via Pascoli, 06123 Perugia, Italy
*
CCorresponding author. Email: palmerini@fisica.unipg.it
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Abstract

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We present computations of nucleosynthesis in red giants and Asymptotic Giant Branch (AGB) stars of Population I experiencing extended mixing. The assumed physical cause for mass transport is the buoyancy of magnetized structures, according to recent suggestions. The peculiar property of such a mechanism is to allow for both fast and slow mixing phenomena, as required for reproducing the spread in Li abundances displayed by red giants and as discussed in an accompanying paper. We explore here the effects of this kind of mass transport on CNO and intermediate-mass nuclei and compare the results with the available evidence from evolved red giants and from the isotopic composition of presolar grains of AGB origin. It is found that a good general accord exists between predictions and measurements; in this framework we also show which type of observational data best constrains the various parameters. We conclude that magnetic buoyancy, allowing for mixing at rather different speeds, can be an interesting scenario to explore for explaining together the abundances of CNO nuclei and of Li.

Keywords

nuclear reactions, nucleosynthesis, abundancesstars: AGBstars: chemically peculiarstars: evolution
Type
Theory, Evolution and Models
Information
Publications of the Astronomical Society of Australia , Volume 26 , Issue 3 , 2009 , pp. 161 - 167
Copyright
Copyright © Astronomical Society of Australia 2009

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