A search for stars of very low metal abundance. II

Details A search for stars of very low metal abundance. II A search for stars of very low metal abundance. II

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103.1987b&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 103, no. 6, June 1992, p. 1987-2034. Research supported by Michigan State University

Astronomy and Astrophysics

Astronomy

335

Metallicity, Stellar Composition, Stellar Spectrophotometry, Abundance, Color-Color Diagram, Spectral Line Width, Star Formation, Stellar Magnitude, Ubv Spectra

Scientific paper

Spectroscopic observations for 1044 stars located primarily in the southern Galactic hemisphere are reported; the stars were chosen from a list of candidate metal-deficient stars discovered in the HK objective-prism survey. Radial velocities and line indices based on the equivalent widths of Ca II, K, H-gamma and H-delta, and the CH G band are reported. Estimates of metallicity for 874 stars with derived abundances less than -0.5 are presented. The number of extremely metal-poor stars (Fe/H is not greater than -2.0) reported in the present sample is roughly quadruple the same size of nonkinematically selected stars of similar metal abundance reported in previous work, and is on the order of the total previous samples of stars in this abundance regime when all sources are included. The number of stars with Fe/H not greater than -3.0 in the present sample is seven times the number of previously identified stars with spectroscopically determined abundances which are this low.

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