A first catalogue of automatically selected UV-excess sources from the UVEX survey

Abstract

We present the first catalogue of point-source UV-excess sources selected from the UVEX survey. UVEX images the Northern Galactic Plane in the U, g, r and HeI5875 bands in the Galactic latitude range -5deg<b<+5deg. Through an automated algorithm, which works on a field-to-field basis, we select blue UV-excess sources in 211 square degrees from the (U-g) vs. (g-r) colour-colour diagram and the g vs. (U-g) and g vs. (g-r) colour-magnitude diagrams. The UV-excess catalogue covers the magnituderange 14<g<22.5, contains 2170 sources and consists of a mix of white dwarfs, post-common-envelope objects, interacting binaries, quasars and AGN. Two other samples of outliers were found during the selection: i) a 'subdwarf' sample, consisting of no less than 9872 candidate metal-poor stars or lightly reddened main-sequence stars, and ii) a 'purple' sample consisting of 803 objects, most likely a mix of reddened late M-giants, T Tauri stars, planetary nebulae, symbiotic stars and carbon stars. Cross-matching the selected UV-excess catalogue with other catalogues aids with the first classification of the different populations and shows that more than 99% of our selected sources are unidentified sources.

accepted for publication in MNRAS, 24 pages, 17 figures

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• The VST Photometric Halpha Survey of the Southern Galactic Plane and Bulge (VPHAS+)
• Pre-main-sequence isochrones -- I. The Pleiades benchmark
• IGAPS: the merged IPHAS and UVEX optical surveys of theNorthern Galactic Plane
• A search for white dwarfs in the Galactic plane: the field and the open cluster population
• The OmegaWhite Survey for short period variable stars II: An overview of results from the first four years
• Spectroscopic identifications of blue H-alpha excess sources in the Kepler field-of-view
• Hot subdwarfs in close binaries observed from space II: Analysis of the light curves
• Interesting Features in the Combined GALEX and Sloan Color Diagrams of Solar-like Galactic Populations
• Spectroscopic follow-up of UV-excess objects selected from the UVEX survey
• A determination of the space density and birth rate of hydrogen-line (DA) white dwarfs in the Galactic Plane, based on the UVEX survey
• UV-excess sources with a red/IR-counterpart: low-mass companions, debris disks and QSO selection