Abstract
view Abstract Citations (158) References (80) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Survey of Proper-Motion Stars. X. The Early Evolution of the Galaxy's Halo Carney, Bruce W. ; Latham, David W. ; Laird, John B. Abstract The recent history of work bearing on the early chemical/dynamical evolution of the Galaxy, and the relation of the halo population to the disk population(s) are discussed. In particular, the mean rotational velocity v(rot), and planar orbital eccentricity (e) are considered as functions of time, inferred from mean metallicity. For m/H less than about -1, signs of dynamicl evolution in mean v(rot) or mean e are not detected. It is argued that (e) for metal-poor stars is about 0.6, not 0.8 as previously believed, and is even lower in the three-dimensional case. It is pointed out that all the data are consistent with the high-velocity, low metallicity halo population having had a chemical and dynamical history almost independent of the Galactic disk. It is proposed that the halo was assembled from mergers of small satellites with the Galaxy along the lines discussed by Searle and Zinn (1978). It is further proposed that the Galactic bulge originated from the gaseous outflow from the Galaxy's halo and these fragments. Publication: The Astronomical Journal Pub Date: February 1990 DOI: 10.1086/115351 Bibcode: 1990AJ.....99..572C Keywords: Galactic Evolution; Halos; Sky Surveys (Astronomy); Stellar Motions; Angular Velocity; Chemical Evolution; Milky Way Galaxy; Astronomy; GALAXIES: THE GALAXY; STARS: POPULATION II; STARS: SUBDWARFS; STARS: HIGH-VELOCITY full text sources ADS | data products SIMBAD (86) 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 8: 1989AJ.....97..423C Part 10: 2001AJ....122.3419C Part 11: 2002AJ....124.1132G Part 12: 2002AJ....124.1144L Part 13: 2005AJ....129.1886C
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