On the occurrence of enhanced lithium in Magellanic Cloud red giants

Details On the occurrence of enhanced lithium in Magellanic Cloud red giants On the occurrence of enhanced lithium in Magellanic Cloud red giants

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...361l..69s&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 361, Oct. 1, 1990, p. L69-L72. Research supported by the Robert A

Astronomy and Astrophysics

Astrophysics

118

Abundance, Asymptotic Giant Branch Stars, Lithium, Magellanic Clouds, Red Giant Stars, Metallicity, Nuclear Fusion, Spectral Resolution, Stellar Evolution, Stellar Luminosity

Scientific paper

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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