2007ApJ...662L.111K

Halo samples that have no kinematic bias have been successfully isolated by photometric observations. We show that the NUV magnitude of the GALEX All-Sky Survey can be used, together with Johnson BV magnitudes in a (NUV-V)₀ versus (B-V)₀plot, to distinguish blue horizontal branch (BHB) from other A stars of the same (B-V) color for 12<V<18. In addition, we use SDSS gr magnitudes in a (NUV-r)₀ versus (g-r)₀plot for 14<r<18. The faint limit will be extended by ∼3 mag for the GALEX Medium-Deep Survey. Attempts to use NUV in conjunction with 2MASS magnitudes and ROTSE m_r magnitudes did not prove useful. The (NUV-V)₀versus (B-V)₀plot was used to examine BHB star candidates of varying quality near the south Galactic pole. We conclude that the addition of the GALEX NUV significantly adds to the reliability with which these stars can be identified.