SIMBAD references

2008AJ....135..564B - Astron. J., 135, 564-574 (2008/February-0)

The Century Survey Galactic Halo Project. III. A complete 4300°2 survey of blue horizontal branch stars in the metal-weak thick disk and inner halo.

BROWN W.R., BEERS T.C., WILHELM R., ALLENDE PRIETO C., GELLER M.J., KENYON S.J. and KURTZ M.J.

Abstract (from CDS):

We present a complete spectroscopic survey of 2414 2MASS-selected blue horizontal branch (BHB) candidates selected over 4300deg2 of the sky. We identify 655 BHB stars in this non-kinematically selected sample. We calculate the luminosity function of field BHB stars, and find evidence for very few hot BHB stars in the field. The BHB stars located at a distance from the Galactic plane|Z| < 4 kpc trace what is clearly a metal-weak thick disk population, with a mean metallicity of [Fe/H] = -1.7, a rotation velocity gradient of dvrot/d|Z| = -28±3.4 km.s–1 in the region|Z| < 6 kpc, and a density scale height of hZ= 1.26±0.1 kpc. The BHB stars located at 5 <|Z| < 9 kpc are a predominantly inner-halo population, with a mean metallicity of [Fe/H] = -2.0 and a mean Galactic rotation of -4±31 km.s–1. We infer the density of halo and thick disk BHB stars is 104±37 kpc–3 near the Sun, and the relative normalization of halo to thick-disk BHB stars is 4±1% near the Sun.

Abstract Copyright:

Journal keyword(s): Galaxy: halo - Galaxy: stellar content - stars: early-type - stars: horizontal-branch

VizieR on-line data: <Available at CDS (J/AJ/135/564): table2.dat table3.dat>

Nomenclature: Table 2: CHSS NNNN (Nos 1690-4015) added.

Simbad objects: 2416

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2020.12.02-07:51:54

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