Lithium Isotopic Abundances in Old Stars.

Lithium is an element of great importance from a cosmological point of view. Observations of its light isotope 6Li are very delicate and in the literature, detections for only a handful of metal-poor stars are found. High quality spectra (S/N∼450, R∼100000) of the Li i 670.8 nm resonance line of six metal-poor stars, taken at the Subaru telescope, are being analysed. The results based on the still early stage of the analysis suggest one possible detection and four possible upper limits (including the two most metal-poor stars in the sample) for 6Li. The observed spectra of the remaining star suggest that there is very little 6Li, if any at all. [ABSTRACT FROM AUTHOR]