Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95.1727f&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 95, June 1988, p. 1727-1734.
Astronomy and Astrophysics
Astronomy
16
G Stars, Galactic Nuclei, Giant Stars, K Stars, Metallic Stars, Radial Velocity, Chemical Composition, Density Distribution, Heavy Elements, Spectrum Analysis
Scientific paper
Radial velocities of small samples of G and K giants previously identified in high-galactic-latitude fields in SA 94 and Serpens are presented and analyzed for dependences on metallicity and galactocentric distances. In each field, the small samples of seven metal-poor stars with Fe/H less than -0.8 show mean radial velocities and high velocity dispersions expected for the halo population. For stars more metal rich than Fe/H = -0.8, there is no strong evidence in either field for a dependence of velocity dispersion on metallicity. In Serpens, the dispersion of 50 km/s for the 32 metal-rich stars is in good agreement with that expected for a thick-disk population. In SA 94, thirteen stars with Fe/H greater than -0.8 show a uniform dispersion of 29 km/s, in agreement with the expected old-disk kinematics. The contrast between results for the two fields is suggestive, but the small sizes of the samples prevent any strong conclusions from being drawn.
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