Population studies. VI - The transition from halo to thin disk

Details Population studies. VI - The transition from halo to thin disk Population studies. VI - The transition from halo to thin disk

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...337..272n&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 337, Feb. 1, 1989, p. 272-292.

Astronomy and Astrophysics

Astrophysics

69

Horizontal Branch Stars, Late Stars, Milky Way Galaxy, Star Distribution, Astronomical Photometry, Disks, Globular Clusters, Radial Velocity

Scientific paper

DDO observations are presented and analyzed for a sample of 157 stars towards the south Galactic pole. There is a dearth of red horizontal branch stars and a predominance of somewhat cooler giants. For z greater than 1 kpc, these objects are identified with the clump and red giant branch stars in the old, metal-poor open clusters. It is suggested that the bulk of what some researchers call the thick disk is younger than the disk globular clusters by at least 3-6 Gyr. A well-defined composition gradient is observed perpendicular to the Galactic plane. No evidence is found for any stars with (Fe/H) greater than -0.3 at distances greater than 2 kpc from the plane. It is argued that, of the models which have been suggested to explain the thick-disk phenomenon, the pressure-supported collapse models are in best accord with the observations.

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