Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...603..119d&link_type=abstract
The Astrophysical Journal, Volume 603, Issue 1, pp. 119-126.
Astronomy and Astrophysics
Astronomy
28
Galaxy: Globular Clusters: General, Stars: Abundances, Stars: Agb And Post-Agb, Stars: Evolution, Stars: Interiors
Scientific paper
We compute the evolution of the surface CNO abundances in two types of stars that might have contributed to the star-to-star abundance variations in globular clusters: intermediate-mass asymptotic giant branch stars and low-mass upper red giant branch stars. We show that abundances of [C/Fe]<~-1 accompanied by apparent signatures of oxygen processing, such as very high [N/Fe] or negative [O/Fe], as observed in some of the globular cluster subgiants and red giants, cannot originate from hot-bottom burning in intermediate-mass asymptotic giant branch stars. This is a robust nucleosynthesis prediction. At the same time, such peculiar CNO abundances could come from the vicinity of the hydrogen-burning shell in upper red giant branch stars, provided that some of them had experienced enhanced extra mixing in the past themselves.
Denissenkov Pavel A.
Weiss Alexander
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