Effective temperatures and lithium abundances of halo turnoff stars
Effective temperatures of 30 turnoff stars with -3.2 < [Fe/H] < -1.5 have been derived from the profiles of Balmer lines in high S/N, VLT/UVES spectra. While the systematic error of Teff may be of the order of 100 K, the differential values of Teff are determined with a one-sigma precision of ∼25K. These precise Teff values are used in a study of the slope and dispersion of the Li abundance as a function of [Fe/H]. A small, but significant cosmic dispersion in A (Li) appears to be present...[Show more]
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