Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...283..893r&link_type=abstract
Astronomy and Astrophysics, Vol. 283, NO. 3/MAR(III), P. 893, 1994
Astronomy and Astrophysics
Astrophysics
75
Stars: Abundances - Stars: Activity - Stars - Binaries: Close
Scientific paper
High-resolution spectra of Northern RS CVn binaries obtained at the NSO-Kitt Peak are analyzed with a spectrum synthesis code to derive Li abundances, metallicities and rotation rates. The data are then combined with previous observations of Southern RS CVn binaries obtained at ESO, yielding a total sample of 67 individual components in 54 catalogued RS CVn binaries. We confirm the presence of substantial amounts of Li in many chromospherically active stars in the sample, with no significant difference between the Northern and Southern samples. We specifically address the question of whether these relatively high Li abundances are due to enhanced chromospheric activity or rather are a consequence of evolutionary history in stars of sufficiently high mass. We investigate the dependence of Li abundance on mass by using mass determinations in binary systems as well as comparison with theoretical evolutionary tracks. We show that while Li abundances in subgiants and in the warmer stars of the sample may be consistent with a dependence on mass, there is no clear indication in the data that the cooler giants with larger Li abundances are also the more massive ones. Uncertainties in the comparison with evolutionary tracks may partially be responsible for this negative result. Alternatively, Li depletion and dilution in evolved stars may be more complex than predicted by standard evolutionary models.
Giampapa Mark S.
Pallavicini Roberto
Randich Sofia
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