Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...357..669k&link_type=abstract
Astronomy and Astrophysics, v.357, p.669-676 (2000)
Astronomy and Astrophysics
Astrophysics
25
Nuclear Reactions, Nucleosynthesis, Abundances, Stars: Agb And Post-Agb, Stars: Individual: Irc+10216, Stars: Circumstellar Matter, Radio Lines: Stars
Scientific paper
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.
Busso Maurizio
Dufour Emmanuelle
Forestini Manuel
Gallino Roberto
Kahane Claudine
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