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Title:
The origin of xenon trapped in presolar mainstream SiC grains
Authors:
Pignatari, M.; Gallino, R.; Straniero, O.; Davis, A.
Affiliation:
AA(Dip. di Fisica Generale, Universitàdi Torino, via P. Giuria 1, 10125 Torino, Italia ), AB(Dip. di Fisica Generale, Universitàdi Torino, via P. Giuria 1, 10125 Torino, Italia), AC(Osservatorio Astronomico di Collurania, 64100 Teramo, Italy), AD(Enrico Fermi Institute and Department of Geophysical Sciences, University of Chicago, Chicago (IL 60637, USA))
Publication:
Memorie della Società Astronomica Italiana, v.75, p.729 (2004)
Publication Date:
00/2004
Origin:
MmSAI
Bibliographic Code:
2004MmSAI..75..729P

Abstract

We present an analysis of the origin of the Xe-S component implanted in mainstream presolar SiC grains considering two different scenarios: the first one assumes that xenon is implanted in the grains by cool and partly ionized winds during the AGB phase of carbon stars; the second one assumes that xenon is implanted in the subsequent planetary-nebula phase by hot and strong ionized winds from the central star. A comparison of AGB nucleosynthesis models predictions with measurements in bulk SiC grains is presented. This shows that 134Xe, an r-only isotope with a small s-contribution sensitive to the neutron channel branching at the unstable 133Xe, is a major indicator in favour of the first implantation scenario. This also constrains the mass and the metallicity of the parent AGB stars.

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