Velocity dispersions and mean abundances for Roman's G5-K1 spectroscopic groups

Details Velocity dispersions and mean abundances for Roman's G5-K1 spectroscopic groups Velocity dispersions and mean abundances for Roman's G5-K1 spectroscopic groups

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104..327y&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 104, no. 1, July 1992, p. 327-339.

Astronomy and Astrophysics

Astronomy

5

Abundance, Astronomical Catalogs, Eccentric Orbits, Metallicity, Stellar Composition, Stellar Spectra, Cyanogen, Hydrogen, Iron

Scientific paper

The velocity dispersions and U-V distributions of Roman's (1950, 1952) four spectroscopic groups (weak CN, weak line, strong line, and 4150) are compared with those of groups based only on Fe/H ratio. It is shown that the velocity-dispersion gradient for the Roman spectroscopic groups is greater than for the comparison group for all three velocity components and for the mean orbital eccentricity, with a clearly defined minimum for the strong-line stars and a sharp upturn for the 4150 stars. The results suggest that the Roman's assignment to distinct spectroscopic groups results in more homogeneous groups than the binning on the basis of metallicity.

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