Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...174..116p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 174, no. 1-2, March 1987, p. 116-126.
Astronomy and Astrophysics
Astrophysics
86
Abundance, Dwarf Stars, F Stars, G Stars, K Stars, Late Stars, Lithium, Stellar Composition, Subgiant Stars, Chromosphere, Lithium Isotopes, Spectral Line Width, Stellar Temperature
Scientific paper
The Li abundances of 27 southern dwarfs and subgiants of spectral types F, G, and K are derived using high-resolution spectra obtained with a coude echelle spectrometer. The derived Li abundances are compared with determinations of rotation rates and chromospheric Ca II K fluxes. The relation between the Li abundance and ages is examined. The Li-6/Li-7 isotope ratio is evaluated, and an upper limit of 0.1 is obtained. The data reveal that old slowly rotating stars with low surface activity and high Li content have maintained high Li abundances by reduced metallicity, and the strong Li line in active binaries of the RS CVn type may be related to the presence of huge starspots on their surface and to the lower ionization degree of Li in cool spots. It is noted that for F8-G5 spectral stars a high Li abundance condition is required, but this condition is not adequate for the star to be young.
Cerruti-Sola Monica
Duncan Douglas K.
Pallavicini Roberto
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