Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...256..189l&link_type=abstract
Astrophysical Journal, Part 1, vol. 256, May 1, 1982, p. 189-205. Research supported by the Robert A. Welch Foundation
Astronomy and Astrophysics
Astrophysics
57
Abundance, Late Stars, Line Spectra, Lithium, M Stars, Red Giant Stars, Supergiant Stars, Aluminum, G Stars, High Resolution, K Stars, Main Sequence Stars, Nuclear Reactions, Spectral Resolution, Spectrum Analysis, Stellar Evolution, Stellar Mass Ejection, Titanium Oxides
Scientific paper
A spectrum-synthesis technique accounting for TiO line blanketing and extracting Li abundances was developed to compensate for the unresolved TiO line depression of the Li I 6707 A doublet in high-resolution, high-SNR spectra of 31 M giants and supergiants. Li abundances in a 25-star sample show a large scatter about a mean log epsilon(Li) value of about -0.2. A renewed discussion of Li abundances for G and K giants offers new evidence for Li abundance control by stellar mass, consistent with M giant data. Two stars, Alpha Ori and 119 Tau, show no detectable Li line, and it is suggested that this Li deficiency may result from mass loss at the pre-main sequence phase, or from internal mixing and nuclear processing leading to Li destruction.
Lambert David L.
Luck Earle R.
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