Metallicity and velocity distribution of giants toward the Galactic poles

Details Metallicity and velocity distribution of giants toward the Galactic poles Metallicity and velocity distribution of giants toward the Galactic poles

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...377..442r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 377, Aug. 20, 1991, p. 442-461.

Other

9

Abundance, Galactic Structure, Giant Stars, Late Stars, Metallicity, Milky Way Galaxy, Velocity Distribution, Astronomical Photometry, Astronomical Spectroscopy, Line Of Sight, Maximum Likelihood Estimates, Normal Density Functions

Scientific paper

A numerical algorithm for maximum likelihood estimation is used here to analyze a catalog of line-of-sight velocities for K giants toward the Galactic poles, including metallicity and photometric distance information. The dependence of vertical velocity dispersion sigma(w) on metallicity is studied, and the distribution is modeled as a sum of discrete components, each with an assumed isothermal Gaussian velocity distribution. The optimum representation has three discrete components: a solar abundance thin disk with sigma(w) = 12 + or - 1 km/s, an intermediate old disk with sigma(w) = 28 + or - 2 km/s, and a metal-weak component with sigma(w) = 54 + or - 4 km/s.

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