Population studies - The nature of the thick disk

Details Population studies - The nature of the thick disk Population studies - The nature of the thick disk

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...314l..39n&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 314, March 15, 1987, p. L39-L43.

Astronomy and Astrophysics

Astrophysics

73

Galactic Structure, Milky Way Galaxy, Star Distribution, Metallicity, Radial Velocity, Red Giant Stars, Stellar Evolution, Stellar Motions

Scientific paper

It is shown that the stellar number counts as a function of distance from the Galactic plane, which led Gilmore and Reid to postulate in 1983 the existence of a distinct thick disk as a third major component of the Galaxy, can be well reproduced by the observed properties of a disk with continuously varying properties in the ranges [Fe/H] ⪆ -0.6, σz ⪉ 35 km s-1, asymmetric drift ⪆-10 to -30 km s-1, together with a halo component. It is suggested that the thick disk phenomenon is a manifestation of the (dispersive?) mechanisms which have established the well-established age - metal abundance - velocity dispersion relation for disk stars.

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