Lithium abundances in globular clusters

Details Lithium abundances in globular clusters Lithium abundances in globular clusters

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..149b&link_type=abstract

In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 J

Astronomy and Astrophysics

Astronomy

Globular Clusters, Element Abundances

Scientific paper

Metal poor stars display a constant Li abundance whichever their effective temperature or metallicity: the so called ""Spite Plateau"". If this constant value represents the primordial Li abundance that is the lithium synthesized in the Big Bang the Universal baryonic density may be derived comparing it to nucleosynthesis calculations. In the recent years there has been an active debate on whether these stars have indeed preserved their pristine Li or whether it has been depleted by some stellar phenomenon. Since the Globular Clusters are a homogeneous single-age population they are an ideal testing ground for any theory which predicts Li depletion. As part of the ESO Large Programme (165.L-0263 P.I. R. Gratton) we observed turn-off stars in the Globular Clusters NGC 6397([Fe/H]~-2.0 ) NGC 6752 ([Fe/H]~-1.5) and 47 Tuc ([Fe/H]~-0.7) at high resolution and relatively high signal to noise ratios with the UVES spectrograph on the ESO Kueyen-VLT 8.2m telescope. On behalf of the collaboration I shall report our results on the Li abundances and abundance dispersion or lack thereof in these clusters as well as a re-analysis of extant data of the metal-poor Globular Cluster M92.

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