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

Abstract

view Abstract Citations (156) References (26) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Survey of Proper-Motion Stars. VIII. On the Galaxy's Third Population Carney, Bruce W. ; Latham, David W. ; Laird, John B. Abstract 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. Publication: The Astronomical Journal Pub Date: February 1989 DOI: 10.1086/114992 Bibcode: 1989AJ.....97..423C Keywords: Milky Way Galaxy; Stellar Motions; Stellar Spectrophotometry; Galactic Evolution; Histograms; Metallicity; Stellar Color; Velocity Distribution; Astrophysics; GALAXIES: THE GALAXY; STARS: POPULATION II; STARS: PROPER-MOTION; STARS: HIGH-VELOCITY; STARS: WEAK-LINE; STARS: SUBDWARFS full text sources ADS | data products SIMBAD (6) Related Materials (12) Part 1: 1987AJ.....93..116C Part 2: 1987AJ.....94.1066C Part 3: 1988AJ.....95.1843L Part 4: 1988AJ.....96..378C Part 5: 1988AJ.....96..560C Part 6: 1988AJ.....96..567L Part 7: 1988AJ.....96.1908L Part 9: 1990AJ.....99..572C Part 10: 2001AJ....122.3419C Part 11: 2002AJ....124.1132G Part 12: 2002AJ....124.1144L Part 13: 2005AJ....129.1886C