Other
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102..303r&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 102, July 1991, p. 303-322.
Other
139
Abundance, Metallicity, Subdwarf Stars, Cosmochemistry, Spectral Line Width, Stellar Spectra, Stellar Spectrophotometry
Scientific paper
High-resolution spectra of 19 metal-deficient proper motion stars were examined for basic trends in the abundances for iron and other elements. Results indicate that there is a mild support for the claim by Tomkin et al. (1986) and Carbon et al. (1987) of an upturn in the C/Fe ratio at Fe/H of -2.0, which might reflect an overproduction of carbon in the supernovae of 200-solar-mass, zero-initial-metallicity stars. The abundance ratios of Mg, Si, Ca, Ti, Cr, Sc, and Mn relative to Fe are found to extend the uniform trends previously reported for stars with Fe/H ratio between -2.5 and -1.0, down to at least Fe/H of -3.5. The Ni element is not as overabundant as was reported by Luck and Bond (1983, 1985), and Al element is overabundant with respect to both Fe and Mg. It was found that halo dwarfs have an Mn/Fe underabundance of -0/33 dex, and that the spread in relative abundances of Sr in the most metal-deficient stars is greater than 1 decade.
Bessell Michael S.
Norris John. E.
Ryan Sean G.
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