Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...279l...9s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 279, no. 1, p. L9-L12
Astronomy and Astrophysics
Astrophysics
37
Abundance, Galactic Halos, Line Spectra, Lithium, Metallicity, Stars, Stellar Composition, Hydrogen, Iron, Strontium, Temperature Distribution
Scientific paper
The lithium abundance of seven of the most metal deficient stars of the list of Ryan et al. (1991) is measured. All the observed stars have a very low metallicity: (Fe/H) less than -2.9. Six of the observed stars have a temperature higher than Teff greater than 5500 K: their lithium abundance is about the 'classical' value 2.1 +/- 0.15 dex. A trend of increasing lithium abundance with increasing temperature is found. The slope is s = 0.024 dex/100 K. However, before considering sophisticated interpretations of this slope it would be prudent to investigate the possible sources of systematic errors. Combined with the lithium abundances of very metal-poor stars published in the literature, the abundances presented here show that the recent non-detection of lithium in very metal-poor stars is really exceptional. In the coolest star (a subgiant), the lithium abundance is lower, in agreement with the theory of stellar evolution and with previous observations.
Spite Francois
Spite Monique
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