Abundances in two new ultra-metal-poor giants

Details Abundances in two new ultra-metal-poor giants Abundances in two new ultra-metal-poor giants

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...236l...5m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 236, no. 1, Sept. 1990, p. L5-L8.

Astronomy and Astrophysics

Astrophysics

37

Abundance, Giant Stars, Metallicity, Nuclear Fusion, Chemical Evolution, Stellar Spectra

Scientific paper

Blue Caspec spectra of two faint metal-deficient star candidates selected by Beers et al. (1985) are analyzed, to estimate their chemical abundances. For CS 22885 - 96, the fine analysis with an LTE model atmosphere gives Fe/H = -4.21 + or - 0.20 (the lowest levels ever found in any astronomical object). Abundances for Mg, Na, Ca, Ti, Sc, and Cr are also derived. Mg/Fe is found to be enhanced with respect to the stars with higher metallicity, and Na/Mg is -0,7, providing some evidence for the odd-even effect. The other elements have about the same abundances, relative to Fe, as population II stars. For CS 22881 - 39, Fe/H = -3.53 + or - 0.30.

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