The chemical composition of the extreme halo stars. I - Blue spectra of 20 dwarfs

Details The chemical composition of the extreme halo stars. I - Blue spectra of 20 dwarfs The chemical composition of the extreme halo stars. I - Blue spectra of 20 dwarfs

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...209..211m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 209, no. 1-2, Jan. 1989, p. 211-225.

Astronomy and Astrophysics

Astrophysics

194

Chemical Evolution, Dwarf Stars, Galactic Evolution, Stellar Atmospheres, Stellar Composition, Astronomical Spectroscopy, Halos, Metallicity, Thermodynamic Equilibrium

Scientific paper

Spectra obtained with the ESO Cassegrain echelle spectrograph are used to determine the abundances of 13 elements in the atmospheres of 20 extreme halo dwarfs. It is found that the alpha elements Mg, Ca, and Ti are overabundant with respect to Fe, that the Cr/Fe ratio is solar at all metallicities, and that Al is overdeficient relative to Mg. The results also indicate that the s elements Sr, Y, and Ba are overdeficient with respect to Fe in stars with Fe/H ratios of less than 2.3, and that for ratios greater than 2.3 the s element abundances relative to Fe are roughly constant (at either solar or higher values).

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