Lithium in LMC carbon stars

Details Lithium in LMC carbon stars Lithium in LMC carbon stars

2003-04-16

arxiv.org/abs/astro-ph/0304297v1

Mon.Not.Roy.Astron.Soc.341:1290,2003

Astronomy and Astrophysics

Astrophysics

10 pages, 8 figures, Latex; in press, MNRAS

Scientific paper

10.1046/j.1365-8711.2003.06502.x

Nineteen carbon stars that show lithium enrichment in their atmospheres have been discovered among a sample of 674 carbon stars in the Large Magellanic Cloud. Six of the Li-rich carbon stars are of J-type, i.e. with strong 13C isotopic features. No super-Li-rich carbon stars were found. The incidence of lithium enrichment among carbon stars in the LMC is much rarer than in the Galaxy, and about five times more frequent among J-type than among N-type carbon stars. The bolometric magnitudes of the Li-rich carbon stars range between -3.3 and -5.7. Existing models of Li-enrichment via the hot bottom burning process fail to account for all of the observed properties of the Li-enriched stars studied here.

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