GALEX Hot Stars Catalog with Corollary Data ("GUVCAT-HOTSTARS")

GUVCAT-HOTSTARS presents a set of catalogs that are derived from 71,364 GALEX UV sources with GALEX FUV-NUV≤0.1mag with SDSS photometry. The FUV-NUV limit corresponds to stellar Teff>15,000−20,000K, slightly depending on gravity but nearly reddening-independent for Milky-Way-type dust. Most sources are hot white-dwarfs (WDs) and sub-dwarfs (SDs). Comparing the SED (GALEX FUV, NUV, SDSS u,g,r,i,z) of 35,294 sources having good photometry with colors of stellar models and known objects, the author identified 12,404+1871-1267 binary hot-compact stars with a cooler, less-evolved companion (with a possible 8%−15% contamination by low-redshift QSOs), and 22,848+1267-3853 single-star candidates. Single-star counts are an upper limit because pairs of similar stars have single-star-like SED, and hot-WDs with main-sequence companions of certain types (depending on WD's radius) are missed or counted as single in the available wavelength range and selection.