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.
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Luck et al. (1982) studied this question.