Light element abundances in barium stars

Details Light element abundances in barium stars Light element abundances in barium stars

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...262..216b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 262, no. 1, p. 216-228.

Astronomy and Astrophysics

Astrophysics

32

Asymptotic Giant Branch Stars, Barium, Light Elements, Metallic Stars, Stellar Composition, Abundance, Binary Stars, Nuclear Fusion

Scientific paper

The paper obtains abundances of the elements Li, C, N, O, and Al, as well as the C-12:C-13 and Mg-24:Mg-25:Mg-26 isotopic ratios for 11 barium stars with the aim of deriving constraints on the nucleosynthesis event responsible for the chemical peculiarities observed in the envelope of these stars. Constraints on the composition of the matter that has polluted the barium star envelope can also be derived from the C-12:C-13 and C-12:O-16 ratios. For most barium stars, these ratios are compatible with pollution by matter from cool carbon stars. It is suggested that, if the accretion of matter from a cool carbon star companion occurs when the barium star is still on the main sequence, the low C-12:C-13 ratios can be reconciled with the carbon overabundance by considering the effect on the first dredge-up of the prior enrichment of the envelope by C-12 from the accreted matter.

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