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STEFFEN , Matthias

Last name: STEFFEN

First name: Matthias

November 9, 2009 (v1)

Conference paper

Metadata-only

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

Sbordone, Luca Bonifacio, Piercarlo Caffau, Elisabetta

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 Teff determination, since the Li I 670.8 nm doublet is highly temperature sensitive. In this short contribution we...

Uploaded on: December 3, 2022
August 10, 2009 (v1)

Conference paper

Metadata-only

The metal-poor end of the Spite plateau

Sbordone, Luca Bonifacio, Piercarlo Caffau, Elisabetta

We present the largest sample available to date of lithium abundances in extremely metal poor (EMP) Halo dwarfs. Four Teff estimators are used, including IRFM and Halpha wings fitting against 3D hydrodynamical synthetic profiles. Lithium abundances are computed by means of 1D and 3D-hydrodynamical NLTE computations. Below [Fe/H]~-3, a strong...

Uploaded on: December 3, 2022