The first detection of a Li-rich giant was a serendipitous discovery by Wallerstein & Sneden (1982). A systematic survey was carried out by Brown et al. (1989), by observing 644 giants, where 10 of them were revealed to be Li-rich. In a survey to search for T Tauri stars Gregorio-Hetem et al. (1992) detected 4 Li-rich giants. Other Li-rich giants were reported in the literature and about 30 Li-rich giants are currently known.
A systematic search of Lithium-rich giants (LRG) based on IRAS colours has been carried out by Castilho et al. (1998). Spectra including the Li I 670.78 nm line have been obtained for a list of candidates with IRAS colours on a [25-12] vs. [60-25] diagram in the locus defined by the already known LRG (Gregorio-Hetem et al. 1993; Castilho et al. 1998). In the present work, we show the results of a detailed analysis for a sample of 16 stars, among which 10 were discovered in our survey: 4 with a strong Li line, and 6 with a moderate Li line (Gregorio-Hetem et al. 2000) and the other 6 ones are previously known LRG. In Castilho et al. (1995) a detailed analysis was already presented for HD 146850.
In Sect. 2 the observations and data reduction are described. In Sects. 3 and 4 the detailed analysis of the atmospheric parameters is presented. In Sect. 5 the abundances are derived, and general discussion and conclusions are drawn in Sects. 6 and 7.
© European Southern Observatory (ESO) 2000
Online publication: January 29, 2001