Population studies. IV - The Rose 'red horizontal branch' candidates as probes of the thick disk

Details Population studies. IV - The Rose 'red horizontal branch' candidates as probes of the thick disk Population studies. IV - The Rose 'red horizontal branch' candidates as probes of the thick disk

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93..616n&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 93, March 1987, p. 616-623.

Astronomy and Astrophysics

Astronomy

29

Disk Galaxies, Horizontal Branch Stars, Red Giant Stars, Cyanogen, Globular Clusters, Metallicity, Open Clusters, Stellar Color

Scientific paper

DDO observations are reported for ten of the Upgren red giants which Rose (1985) has identified as red horizontal-branch (RHB) stars of a globular cluster type population in the Gilmore-Reid thick disk. It is shown that the RHB candidates are indistinguishable from the clump stars in the old, metal-deficient ([Fe/H] = -0.6), open cluster NGC 2243, and that their identification as RHB stars is not unique. DDO and BV observations are also presented for an unbiased sample of 121 G0-G7 giants from the Michigan spectral catalogs. It is argued that the clumping of the RHB candidates and the metal-poor subset ([Fe/H] ≤ -0.4) of the unbiased sample in B-V is more suggestive of their membership in the old-disk population than of belonging to a globular-cluster-like one. It is noted that the line-of-sight velocity dispersion of 40±7 km s-1 found by Rose is indistinguishable from the value of 35±6 km s-1 found by Janes (1975) for the most metal-deficient disk giants in the solar neighborhood.

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