We assembled a catalogue of bright , hot subdwarf and white dwarf stars extracted from a joint ultraviolet , optical , and infrared source list .
The selection is secured using colour criteria that correlate well with effective temperatures T _ { eff } \ga 12 , 000 K. We built a N _ { UV } - V versus V - J diagram for \ga 60 , 000 bright sources using the Galaxy Evolution Explorer ( GALEX ) N _ { UV } magnitude ( N _ { UV } < 14 ) , and the associated Guide Star Catalog ( GSC2.3.2 ) photographic quick-V magnitude and the Two Micron All Sky Survey ( 2MASS ) J and H magnitudes .
This distillation process delivered a catalogue of \approx 700 sources with N _ { UV } - V < 0.5 comprising \sim 160 known hot subdwarf stars and another \sim 60 known white dwarf stars .
A reduced proper-motion diagram built using the proper-motion measurements extracted from the Naval Observatory Merged Astrometric Dataset allowed us to identify an additional \sim 120 new hot subdwarf candidates and \sim 10 hot white dwarf candidates .
We present a spectroscopic study of a subset of 52 subdwarfs , 48 of them analysed here for the first time , and with nine objects brighter than V \sim 12 .
Our sample of spectroscopically confirmed hot subdwarfs comprises ten sdO stars and 42 sdB stars suitable for pulsation and binary studies .
We also present a study of 50 known white dwarfs selected in the GALEX survey and six new white dwarfs from our catalogue of subluminous candidates .
Ultraviolet , optical , and infrared synthetic magnitudes employed in the selection and analysis of white dwarf stars are listed in appendix .