Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...320..115d&link_type=abstract
Astronomy and Astrophysics, v.320, p.115-124
Astronomy and Astrophysics
Astrophysics
25
Stars: Abundances, Stars: Agb, Post-Agb, Stars: Giant, Stars: Interiors, Globular Clusters: General
Scientific paper
We performed detailed nucleosynthesis calculations in hydrogen and helium burning shells as well as for hot bottom burning at the base of convective envelope in a low-metallicity (Z=10^-4^) intermediate-mass star during thermal-pulsing AGB evolution. Based on complete stellar models, up-to-date simple analytical expressions were used to describe the model star and its evolution. Our study concentrated on surface abundances of light elements, such as C, N, O, Na and Al, and their isotopes in order to test a hypothesis of Cottrell and Da Costa (1981ApJ...245L..79C) frequently invoked to explain star-to-star abundance variations in globular-cluster red giants. It is shown that this hypothesis of primordial contamination of intracluster matter by nuclear products from early generation AGB stars fails to reproduce the observed O depletion and Al enhancement. We propose an alternative mechanism which combines some primordial composition anomalies with atmospheric abundance effects produced by deep mixing in globular-cluster red giants. We also suggest observational tests for the verification of our model.
Denissenkov Pavel A.
Wagenhuber Josef
Weiss Alexander
No associations
LandOfFree
Could intermediate-mass AGB stars produce star-to-star abundance variations in globular-cluster red giants? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Could intermediate-mass AGB stars produce star-to-star abundance variations in globular-cluster red giants?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Could intermediate-mass AGB stars produce star-to-star abundance variations in globular-cluster red giants? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1315497