Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978phdt........14c&link_type=abstract
Ph.D. Thesis California Univ., Berkeley.
Astronomy and Astrophysics
Astronomy
8
Galactic Structure, Luminous Intensity, Stellar Luminosity, Stellar Motions, Astronomical Photography, Atmospheric Refraction, Distribution Functions, Dwarf Stars
Scientific paper
Proper motions of stars with V less than or equal 20.5 in SA 51, SA 57, and SA 68 were derived based on a set of Lick 3-m, Hale 5-m, and KPNO 4-m prime-focus plates. Proper motions and photographically determined V and B-V were used to construct reduced proper motion diagrams. A theory is presented for classifying the stars into different populations and luminosity classes with a probabilistic approach based on the distribution function of the reduced proper motion as a function B-V. Based on the fit of the theoretical ridge line to the observed data points in the reduced proper motion diagram, it is concluded that the Population 1 main sequence in the sample has both a higher velocity dispersion and a lower metallicity than those in the solar neighborhood. Evidence is presented for the existence of an intermediate population in the anticenter direction which severely contaminates the subdwarf sample in SA 51.
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