Two new lithium-deficient population II dwarfs

Details Two new lithium-deficient population II dwarfs Two new lithium-deficient population II dwarfs

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...399l..83t&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 399, no. 1, p. L83-L85.

Astronomy and Astrophysics

Astrophysics

44

Dwarf Stars, Lithium, Nuclear Astrophysics, Stellar Composition, Absorption Spectra, Metallicity, Stellar Magnitude, Stellar Spectra

Scientific paper

Observations are reported which show that G122-69 and G139-8 are normal, extremely metal-poor subdwarfs with no detectable lithium. This result challenges the contention that the most metal-deficient halo stars show no dispersion in surface lithium abundance beyond the observational scatter; the ratio of extreme subdwarfs with unmeasurably low lithium abundances may be close to 20 percent. Attempts to identify stellar N(Li) with the lithium fraction generated by big bang nucleosynthesis may therefore have been premature. Larger samples and a more complete understanding of the dispersion must play a key role in further studies of this kind.

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