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Predictions for low-metallicity s-process Lead stars showing peculiar r-process enhancements

Published online by Cambridge University Press:  23 December 2005

S. Bisterzo ,
R. Gallino ,
D. Delaude ,
O. Straniero  and
I. I. Ivans
S. Bisterzo
Affiliation:
Dipartimento di Fisica Generale, Via P. Giuria 1, Torino 10125, Italy email: sarabisterzo@hotmail.com, gallino@ph.unito.it, delaude@studenti.ph.unito.it
R. Gallino
Affiliation:
Dipartimento di Fisica Generale, Via P. Giuria 1, Torino 10125, Italy email: sarabisterzo@hotmail.com, gallino@ph.unito.it, delaude@studenti.ph.unito.it
D. Delaude
Affiliation:
Dipartimento di Fisica Generale, Via P. Giuria 1, Torino 10125, Italy email: sarabisterzo@hotmail.com, gallino@ph.unito.it, delaude@studenti.ph.unito.it
O. Straniero
Affiliation:
Teramo Observatory, INAF, Teramo 64100, Italy email: straniero@oa-teramo.inaf.it
I. I. Ivans
Affiliation:
Dept. of Astronomy, California Institute of Technology, Pasadena email: iii@astro.caltech.edu
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Abstract

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Spectroscopic abundances of s- and r-process enriched very metal-poor stars are interpreted as the result of mass transfer in a binary system from an AGB companion assuming an initial composition of the parental cloud pre-enriched in r elements. The spectroscopic determination of [Na/Fe], [Mg/Fe] and [ls/Fe] permits an estimate of the initial AGB stellar mass, while a value [Zr/Nb] ≈ 0 is a nuclear indicator of an extrinsic AGB in a binary system.

Keywords

Nuclear reactionsnucleosynthesisabundancesstars: abundancesstars: AGBstars: binariesstars: Population IIstars: individual(CS22948-027,CS31062-050)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S228: From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution , May 2005 , pp. 481 - 482
Copyright
© 2005 International Astronomical Union