UVBY - beta photometry of high-velocity and metal-poor stars. VI - A second catalogue, and stellar populations of the Galaxy

Details UVBY - beta photometry of high-velocity and metal-poor stars. VI - A second catalogue, and stellar populations of the Galaxy UVBY - beta photometry of high-velocity and metal-poor stars. VI - A second catalogue, and stellar populations of the Galaxy

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26as...97..951s&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 97, no. 4, p. 951-983.

Astronomy and Astrophysics

Astrophysics

86

Astronomical Catalogs, Galactic Bulge, Galactic Halos, Milky Way Galaxy, Star Distribution, Stellar Spectrophotometry, Stellar Motions, Ubv Spectra, Velocity Distribution, Visual Photometry

Scientific paper

A second catalog of uvby-beta photometry for 553 high-velocity stars is presented. Combining the catalogs, reliable (Fe/H) values are obtained for 1214 stars and reliable kinematic parameters for 1149. The total sample contains at least three significant, distinct stellar populations with properties very similar to those given in the literature of the old thin disk, thick disk, and halo. The thick-disk component has mean (Fe/H) about -0.50 +/- 0.10 dex and sigma(Fe/H) about 0.25 +/- 0.03 dex, but there is evidence for a significant thick-disk contribution down to (Fe/H) about -1.4. A diagonal cut in the V(rot), (Fe/H) diagram indicates that there is not a chemical gradient in the Galactic halo. The mean V(rot), mean (Fe/H) curve for the whole sample indicates that the halo evolved mostly independently of the disk.

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