Lithium abundances in metal-deficient dwarfs

Details Lithium abundances in metal-deficient dwarfs Lithium abundances in metal-deficient dwarfs

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...192..192r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 192, no. 1-2, March 1988, p. 192-205.

Astronomy and Astrophysics

Astrophysics

202

Abundance, Dwarf Stars, Lithium, Metallicity, Stellar Composition, Subdwarf Stars, Big Bang Cosmology, Stellar Atmospheres, Stellar Evolution, Thermodynamic Equilibrium

Scientific paper

New measurements of the lithium abundance in a sample of 37 field dwarfs of low metallicity (-0.6 ≥ [Fe/H] ≥ 3.2) are presented. Combining these observations with those in the literature it is shown that extremely metal-deficient ("EMD") dwarfs ([Fe/H] ≤ -1.4) form a much more homogeneous population with regard to 7Li abundance than stars somewhat more metal-rich. The authors consider that these stars offer the best opportunity to make a reliable measurement of the primordial Li abundance, which they estimate to be log N(Li) = 2.2(±0.15), a value slightly higher than that given by Spite and Spite (1982). Using a recent theoretical curve of Li against the universal baryon to photon ratio, η, from a standard Big Bang model, and the above cited primordial abundance, η is constrained to the range 1.2×10-10 ≤ η ≤ 8×10-10.

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