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Effective temperatures and lithium abundances of halo turnoff stars

Published online by Cambridge University Press:  23 December 2005

P.E. Nissen ,
C. Akerman ,
M. Asplund ,
D. Fabbian  and
M. Pettini
P.E. Nissen
Affiliation:
Department of Physics and Astronomy, University of Aarhus, Denmark email: [email protected]
C. Akerman
Affiliation:
Institute of Astronomy, Cambridge, UK
M. Asplund
Affiliation:
Mount Stromlo Observatory, Australian National University, Australia
D. Fabbian
Affiliation:
Mount Stromlo Observatory, Australian National University, Australia
M. Pettini
Affiliation:
Institute of Astronomy, Cambridge, UK
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Abstract

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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 $T_{\rm eff}$ may be of the order of 100K, the differential values of $T_{\rm eff}$ are determined with a one-sigma precision of ${\sim}25$K. These precise $T_{\rm eff}$ 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.

Keywords

Stars: fundamental parametersstars: abundancescosmology: early universe
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S228: From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution , May 2005 , pp. 101 - 102
Copyright
© 2005 International Astronomical Union

Footnotes

Based on observations collected at ESO, Chile (ESO No. 67.D-0106 and 73.D-0024)