Abstract
view Abstract Citations (66) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Survey of Proper Motion Stars. IX. The Galactic Halo's Metallicity Gradient Carney, Bruce W. ; Aguilar, Luis ; Latham, David W. ; Laird, John B. Abstract Using data already presented for a survey of proper motion stars and the Bahcall, Schmidt, and Soneira (1983) model of the Galaxy, Galactic orbital parameters are computed, including planar and three-dimensional eccentricities, apo- and perigalacticon distances, and maximum distances reached above/below the plane, based on extreme values for R and the absolute value of Z over 15 azimuthal periods. The orbital data are used to bin the survey's stars by apogalacticon and maximum Z distances. In an attempt to isolate a halo population sample, analyses are restricted to those stars that lag behind the local standard of the rest's circular orbital velocity by 50, 100, 150, and 200 km/s. The mean metallicities of the stars in a variety of Rapo and Zmax bins are compared . Publication: The Astronomical Journal Pub Date: January 1990 DOI: 10.1086/115320 Bibcode: 1990AJ.....99..201C Keywords: Halos; Metallic Stars; Milky Way Galaxy; Sky Surveys (Astronomy); Stellar Motions; Heavy Elements; Kinetic Energy; Stellar Mass; Stellar Orbits; Astrophysics; GALAXIES: THE GALAXY; STARS: POPULATION II; STARS: HIGH-VELOCITY; STARS: PROPER-MOTION full text sources ADS | data products SIMBAD (744)
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