Effective temperatures and lithium abundances of halo turnoff stars
Date
2005
Authors
Nissen, Poul E
Akerman, Chris J
Asplund, Martin
Fabbian, Damian
Pettini, Max
Journal Title
Journal ISSN
Volume Title
Publisher
Cambridge University Press
Abstract
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 exemplified by the two very metal-poor stars G64-12 and G64-37.
Description
Keywords
Keywords: Cosmology: early universe; Stars: abundances; Stars: fundamental parameters
Citation
Collections
Source
Type
Book chapter
Book Title
From Lithium to Uranium (S228)