A survey of proper-motion stars. VIII - On the Galaxy's third population

Details A survey of proper-motion stars. VIII - On the Galaxy's third population A survey of proper-motion stars. VIII - On the Galaxy's third population

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97..423c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 97, Feb. 1989, p. 423-430.

Astronomy and Astrophysics

Astronomy

148

Milky Way Galaxy, Stellar Motions, Stellar Spectrophotometry, Galactic Evolution, Histograms, Metallicity, Stellar Color, Velocity Distribution

Scientific paper

Results from a survey of proper-motion stars (Laird et al., 1988) are used to show that a third discrete population may exist within the Galaxy. This population has a mean metallicity m/H of about -0.5, and a metallicity distribution function that appears to be independent of height above the plane. Based on an apparent blue limit to the colors of stars with metallicities near -0.5, this population is found to be very old: similar to the disk globular cluster 47 Tuc. It is suggested that this third population could be the signature of a merger event early in the Galaxy's history, occurring shortly after the disk had formed.

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