Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...253..185p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 253, no. 1, Jan. 1992, p. 185-198. Research supported by ASI and MURST.
Astronomy and Astrophysics
Astrophysics
81
Abundance, Binary Stars, Late Stars, Lithium, Stellar Activity, Stellar Luminosity, Chromosphere, G Stars, K Stars, Line Spectra, Stellar Spectra
Scientific paper
The present survey of the Li I 6708 A line in a sample of spectral type G and K stars with luminosity classes III, IV, and V shows that many K-type stars in the sample, including a large number of RS CVn binaries, show an anomalously high Li abundance relative to typical inactive stars of the same spectral type. Only a few stars in the sample are likely to be premain sequence objects of stars which have recently arrived on the main sequence. Mechanisms that could lead to the enhanced Li absorption in chromospherically active stars are discussed; these encompass large cool spots on the stellar surface, the production of Li in stellar flares by spallation reactions, and the evolution from main-sequence progenitors without, or with very shallow, outer convective zones.
Giampapa Mark S.
Pallavicini Roberto
Randich Sofia
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