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Title:
A survey of lithium in the red giants of the magellanic clouds
Authors:
Smith, Verne V.; Plez, Bertrand; Lambert, David L.; Lubowich, D. A.
Affiliation:
AA(University of Texas, Austin, TX, US), AB(University of Texas, Austin, TX, US), AC(University of Texas, Austin, TX, US), AD(American Institute of Physics, Woodbury, NY)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 441, no. 2, p. 735-746 (ApJ Homepage)
Publication Date:
03/1995
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
ABUNDANCE, ASYMPTOTIC GIANT BRANCH STARS, LINE SPECTRA, LITHIUM, MAGELLANIC CLOUDS, RED GIANT STARS, ASTRONOMICAL SPECTROSCOPY, SKY SURVEYS (ASTRONOMY), SPECTRUM ANALYSIS, STELLAR EVOLUTION, STELLAR INTERIORS
DOI:
10.1086/175395
Bibliographic Code:
1995ApJ...441..735S

Abstract

A spectroscopic search for the Li 6707 A resonance line has been carried out in 112 red giants from both the Small and Large Magellanic Clouds. The spectra are a mixture of high- (R = lambda/delta lambda = 18,000) and low-resolution (R = 4000) data, and the stars surveyed consist of specral types M, S, and C. Most of these stars have absolute bolometric magnitude, Mbol, determinations available from various published investigations. The Li line is detected in 35 of these red giants (29 S stars and six C stars). All stars with a measurable Li I feature are asymptotic giant branch (AGB) stars with the majority (26) being luminous S stars within the narrow luminosity range of -7.2 les than or approximately = Mbol less than or approximately = 6.0 (bar-Mbol = -6.52 +/- 0.38 in this subset of the stars). Abundance estimates of lithium in these stars fall in the range of log epsilon (Li) approximately 1.0-4.0. The presence of Li in these highly evolved AGB stars is ascribed to hot-bottom convective envelope (HBCE) burning and a comparison ofthe Li abundances derived here with published models of HBCE shows reasonably good agreement.

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