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Title:
On the occurrence of enhanced lithium in Magellanic Cloud red giants
Authors:
Smith, Verne V.; Lambert, David L.
Affiliation:
AA(Texas, University; McDonald Observatory, Austin), AB(Texas, University; McDonald Observatory, Austin)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 361, Oct. 1, 1990, p. L69-L72. Research supported by the Robert A. Welch Foundation. (ApJL Homepage)
Publication Date:
10/1990
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Abundance, Asymptotic Giant Branch Stars, Lithium, Magellanic Clouds, Red Giant Stars, Metallicity, Nuclear Fusion, Spectral Resolution, Stellar Evolution, Stellar Luminosity
DOI:
10.1086/185829
Bibliographic Code:
1990ApJ...361L..69S

Abstract

High-resolution spectra have been obtained for 27 red giants in the Magellanic Clouds with Mbol from about -5 to -9. A previous study (Smith and Lambert, 1989) found that five out of five luminous AGB stars in the SMC showed enhanced Li I resonance doublets (6707-A); here it is shown that the Li-strong red giants in both Clouds are luminous (Mbol = -6 to -7) stars on the AGB. Lower luminosity AGB stars show no Li I features, while the very luminous red giants that are identified as massive core-burning supergiants also show no Li I features. The enhanced Li abundances in these luminous AGB stars may be a byproduct of envelope burning in the more massive AGB stars.

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