Other
Scientific paper
Jul 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....114..363c&link_type=abstract
Astronomical Journal v.114, p. 363-375 (1997)
Other
101
Scientific paper
We report [Fe/H] results for a sample of five high-velocity metal-poor halo population stars and five comparably metal-poor stars thought to have kinematics typical of an older, hotter disk population. We also derive abundances of lithium, oxygen, magnesium, silicon, calcium, titanium, and barium for many of the stars. Four of the candidate disk population stars are found to be subgiants, and a re-evaluation of their kinematics show that they have kinematics typical of the halo population. One star, G190-15, is confirmed to be a dwarf with disk-like kinematics: U = -10, V = -80, W = -90 \kms. It is indistinguishable in [X/Fe] from other metal-poor stars with higher velocities, however. The most interesting star is the high-velocity subgiant BD+80° 245, which is found to have <[``alpha "/Fe]> = -0.29+/-0.02 despite its low metallicity, [Fe/H] = -1.86. It is also extremely deficient in barium, [Ba/Fe] ~ -1.8, and has a large apogalacticon distance, over 20 kpc. It has experienced a very different chemical history than have other metal-poor stars found in the solar neighborhood.
Aguilar Arevalo L.
Carney Bruce W.
Laird John B.
Latham David W.
Sneden Chris
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