Lithium abundances in extremely metal-poor stars

Details Lithium abundances in extremely metal-poor stars Lithium abundances in extremely metal-poor stars

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..581b&link_type=abstract

In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 J

Astronomy and Astrophysics

Astronomy

Stellar Abundances

Scientific paper

In the course of the ESO Large Programme ""First Stars"" we have observed with the UVES spectrograph at the 8.2m Kueyen-VLT telescope more than thirty stars which were classified as Turn-Off based on medium resolution spectra. Effective temperatures for these stars were derived by fitting the ings of the H-alpha lines. The constant lithium abundance found in metal-poor stars is generally understood to have been produced primordially. If this is the case it provides a measure of the baryonic density which may be compared to the valued recently measured from the fluctuations of the cosmic microwave background by the WMAP experiment. Howevere this may not be the case if the Li observed on the surface of these stars has been increased by Galactic production or decreased by atmospheric phenomena such effects could be highlighted by the existence of variations with metallicity and/or effective temperature of the Li abundance. In this poster we report on the measurement of lithium abundances in this unique homogeneous sample of extremely metal poor stars which provides important information on the Li content of the early Galaxy.

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