The metal-poor end of the Spite plateau: gravity sensitivity of the H alpha wings fitting.

L. Sbordone, P. Bonifacio, E. Caffau,H. -G. Ludwig,N. Behara, J. I. Gonzalez-Hernandez,M. Steffen, R. Cayrel,B. Freytag,C. Van't Veer,P. Molaro,B. Plez,T. Sivarani,M. Spite,F. Spite,T. C. Beers,N. Christlieb, P. Francois,V. Hill

Proceedings of The International Astronomical Union（2010）

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摘要

We recently presented (Sbordone et al 2009a) the largest sample to date of lithium abundances in extremely metal-poor (EMP) Halo dwarf and Turn-Off (TO) stars One of the most crucial aspects in estimating Li abundances is the T-eff determination, since the Li 1670.8 nm doublet is highly temperature sensitive In this short contribution we concentrate on the T-eff determination based on Ho wings fitting, and on its sensitivity to the chosen stellar gravity

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Nuclear reactions, nucleosynthesis,Galaxy halo,stars abundances, Population II

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