Heavy-element synthesis in AGB and post-AGB stars of low mass

Details Heavy-element synthesis in AGB and post-AGB stars of low mass Heavy-element synthesis in AGB and post-AGB stars of low mass

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.223..709m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 223, Dec. 15, 1986, p. 709-725.

Astronomy and Astrophysics

Astronomy

19

Asymptotic Giant Branch Stars, Heavy Elements, Nuclear Fusion, Red Giant Stars, Stellar Evolution, Stellar Mass, Abundance, Anomalies, Neutron Absorbers, Neutron Sources, Stellar Envelopes, Turbulent Mixing

Scientific paper

The heavy-element abundance anomalies in many low-mass red giants provide evidence that some form of mixing between the envelopes and interiors of such stars prevails at this phase of stellar evolution. This would enable neutron absorption reactions to proceed via the C-13(alpha, n)O-16 neutron source. It is widely believed that this mixing originates from events on the AGB and post-AGB phase of evolution. Calculations are carried out which investigate the heavy-element production arising from repeated mixing events on the AGB and single mixing events on the post-AGB, in order to form a theoretical basis against which observations of the abundance anomalies in red giants can be compared. The difference in the abundance distribution produced at the AGB with that produced at the post-AGB is stressed. It is shown how this difference could help resolve an outstanding problem regarding the origin of the RCrB stars.

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