Spectroscopic analysis of lithium-rich giants

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Lithium-rich giants (LRG) are rare and quite unknown, but very interesting as they probably are the main agent of increasing the lithium abundance in the interstellar medium. The actual abundances are ten times higher then the primordial value. The characteristics of the LRG are in general the same of normal red giants, but they have much more lithium than could be expected. We have developed a long-term project to better understand these objects, by searching them (in order to increase the number of identified LRG) and also by studying their nature, with detailed spectral analysis. In a previous work we have prepared a list of candidates based on IRAS colors typical of LRG and we have obtained medium-resolution spectra in order to confirm their nature. Five lithium-rich giants were found by us, as also other six giants with moderate lithium-line. Before that work, only about 20 LRG were known. We present here the results from a detailed spectral analysis of LRG discovered by us and others from literature, and we discuss the contribution of these stars for the lithium production in the universe.

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