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Title:
Improved isotopic ratio determinations in IRC+10216, the progenitor mass and the s process
Authors:
Kahane, C.; Dufour, E.; Busso, M.; Gallino, R.; Lugaro, M.; Forestini, M.; Straniero, O.
Affiliation:
AA( Laboratoire d'Astrophysique de l'Observatoire de Grenoble B.P. 53, 38041 Grenoble Cedex 9, France), AB( Laboratoire d'Astrophysique de l'Observatoire de Grenoble B.P. 53, 38041 Grenoble Cedex 9, France), AC(Osservatorio Astronomico di Torino, 10025 Torino, Italy), AD(Dipartimento di Fisica Generale, Universitá di Torino, Via P. Giuria 1, 10125 Torino, Italy), AE(Department of Mathematics, Monash University, Clayton 3168, Victoria, Australia), AF( Laboratoire d'Astrophysique de l'Observatoire de Grenoble B.P. 53, 38041 Grenoble Cedex 9, France), AG(Osservatorio Astronomico di Collurania, 64100 Teramo, Italy)
Publication:
Astronomy and Astrophysics, v.357, p.669-676 (2000) (A&A Homepage)
Publication Date:
05/2000
Origin:
A&A
A&A Keywords:
NUCLEAR REACTIONS, NUCLEOSYNTHESIS, ABUNDANCES, STARS: AGB AND POST-AGB, STARS: INDIVIDUAL: IRC+10216, STARS: CIRCUMSTELLAR MATTER, RADIO LINES: STARS
Bibliographic Code:
2000A&A...357..669K

Abstract

We present an improved determination of the chlorine isotopic ratio in the circumstellar envelope IRC+10216. This determination is the first clear evidence that in this circumstellar envelope elements heavier than the CNO do show deviations from the solar isotopic ratios, thus allowing a detailed comparison with quantitative model predictions. We have compared these data, together with other measurements for Mg and CNO isotopes, with predictions of AGB stellar models of solar metallicity and initial masses 1.5, 3 and 5 Msun computed with the FRANEC evolutionary code. The comparison shows excellent agreement for the results of a low mass AGB model and remarkable disagreement for those of the 5 Msun b star. We briefly discuss the impact that model uncertainties can have on our conclusions.

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