Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...297l...1f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 297, no. 1, p. L1-L4
Astronomy and Astrophysics
Astrophysics
4
Abundance, Dwarf Stars, K Stars, Line Spectra, Lithium, Stellar Spectra, Atmospheric Models, Mass, Stellar Evolution, Stellar Models
Scientific paper
We report recent high resolution, high signal to noise ratio spectroscopic observations of the region around the Li I 6707.8 A line in two apparently old field late K-type main sequence stars. These stars exhibit a small equivalent width line at the same wavelength, within 10 mA, as the Li I line. Lithium is expected to be fully depleted in old low mass stars, and therefore its presence in Hyades age (or older), 0.6 solar mass stars is surprising. Given the richness and complexity of the spectra in these cool stars, the identification of the line with the Li I line is not obvious. We briefly discuss, using model atmospheres and synthetic spectra alternative explanations for this feature. Finally, we briefly look at the implications of the presence of lithium in low mass stars for current stellar interior models.
Favata Fabio
Micela Giuseppina
Sciortino Salvatore
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