Other
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981aj.....86.1643s&link_type=abstract
Astronomical Journal, vol. 86, Nov. 1981, p. 1643-1657.
Other
54
Abundance, Metallic Stars, Milky Way Galaxy, Radial Velocity, Subdwarf Stars, Vertical Distribution, Interstellar Chemistry, Main Sequence Stars, Mass Distribution, Stellar Luminosity, Stellar Models, Stellar Motions, Stellar Spectrophotometry, Ubv Spectra, Ultraviolet Spectra
Scientific paper
The combination of the radial velocities of 31 newly identified subdwarfs with data for 83 other subdwarfs from Sandage (1969) expands the sample, to underscore the correlation between velocity in the plane (W(O)) and reduced ultraviolet excess. A chemical gradient evident perpendicular to the plane may be interpreted as the sum of two velocity components with different distributions over metallicity. The distribution of metallicity expected at any height is calculated from the observed sigma and W(O) value distributions in the plane, using both a continuum and a two-component kinematic model. The calculations show that observations of the actual sigma(0.6) distributions in situ, using F and G subdwarfs having brightness values higher than 18, presents powerful conditions on an eventual, realistic model of the chemical gradient observed over the first 5 kpc of the halo.
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