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B.V. Castilho 1,2,
J. Gregorio-Hetem 1,
F. Spite 3,
B. Barbuy 1 and
M. Spite 3
Received 24 July 2000 / Accepted 18 October 2000
A detailed analysis has been carried out for a sample of 16 red giants showing a strong Li I 670.8 nm line. Ten of them were detected in a survey by Castilho et al. (1998), and the other 6 stars are Li-rich giants selected from the literature.
Element abundances in the sample Li-rich giants are similar to those in normal red giants, differing only by their high Li abundance and infrared excess. This suggests that Li-rich giants may correspond to a phase of stellar evolution of normal red giants, when Li is produced and transported to the atmosphere.
Key words: stars: late-type stars: evolution stars: atmospheres stars: abundances
* Observations collected at the European Southern Observatory - ESO, Chile, Laboratório Nacional de Astrofísica - LNA, Brazil and Observatoire de Haute Provence - OHP, France
Send offprint requests to: B.V. Castilho
Online publication: January 29, 2001