Evidence for clustering of field horizontal-branch stars in the Galactic halo

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Horizontal Branch Stars, Milky Way Galaxy, Stellar Spectrophotometry, Distance, Monte Carlo Method, Spectral Line Width

Scientific paper

An investigation of the clustering of field horizontal-branch stars in the Galactic halo is reported which examines this question using a catalog of over 4400 candidate field horizontal-branch stars distributed over roughly 2300 sq deg of sky, primarily in the southern Galactic hemisphere. A two-point correlation analysis indicates that the catalog contains an excess of stellar pairs with angular separations of less than 10 arcsec; at the approximate distances of these stars (5-8 kpc from the Sun) the corresponding linear separations are r of less than 25 pc. The possible connection with loose groups of halo field horizontal-branch stars noted previously by Sommer-Larsen and Christensen (1987) and by Beers and Doinidis (1988) is discussed.

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