U, V, W velocity components for the old disk using radial velocities of 1295 stars in the three cardinal Galactic directions

Details U, V, W velocity components for the old disk using radial velocities of 1295 stars in the three cardinal Galactic directions U, V, W velocity components for the old disk using radial velocities of 1295 stars in the three cardinal Galactic directions

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93..592s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 93, March 1987, p. 592-609.

Astronomy and Astrophysics

Astronomy

40

Disk Galaxies, Radial Velocity, Solar Neighborhood, Stars, Tables (Data), Velocity Distribution

Scientific paper

New radial velocities are presented for 1295 stars chosen at random near the three cardinal galactic directions of l = 180°, b = 0°; l = 90°, b = 0°; and b = 90°, giving the distribution in U, V, and W, respectively, from the radial velocities alone. The measurements were made with the coudé spectrograph of the Mount Wilson 100 in. Hooker reflector. The purpose of the program is to set limits on the density normalization in the solar neighborhood of the old thin disk, the old thick disk, and the halo. Many more high-velocity stars are present in the authors unbiased sample than expected from previous estimates of the normalization. The data suggest the density ratios in the solar neighborhood to be ≡90%, 10%, and ≡0.5% for the thin disk, thick disk, and halo populations, respectively.

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