A survey of proper-motion stars. X - The early evolution of the Galaxy's halo

Details A survey of proper-motion stars. X - The early evolution of the Galaxy's halo A survey of proper-motion stars. X - The early evolution of the Galaxy's halo

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99..572c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 99, Feb. 1990, p. 572-589. Research supported by Bowling Green State University.

Astronomy and Astrophysics

Astronomy

149

Galactic Evolution, Halos, Sky Surveys (Astronomy), Stellar Motions, Angular Velocity, Chemical Evolution, Milky Way Galaxy

Scientific paper

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.

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