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

Kars Verbeek, Eelco de Groot, Paul J. Groot, Simone Scaringi, Janet Drew, Robert Greimel, Mike J Irwin, Eduardo González-Solares, Boris T. Gänsicke, Jorge Casares, Jesus M. Corral-Santana, Niall Deacon, Danny Steeghs

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We present the first catalogue of point-source ultraviolet (UV)-excess sources selected from the UV-Excess Survey of the Northern Galactic Plane (UVEX). UVEX images the Northern Galactic Plane in the U,g,r and bands in the Galactic latitude range -5° < b < +5°. 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) versus (g-r) colour-colour diagram and the g versus (U-g) and g versus (g-r) colour-magnitude diagrams. The UV-excess catalogue covers the magnitude range 14 < g < 22.5, contains 2170 sources and consists of a mix of white dwarfs, post-common-envelope objects, interacting binaries, quasars and active galactic nuclei. 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 per cent of our selected sources are unidentified sources.

Original languageEnglish
Pages (from-to)1115-1134
Number of pages20
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Publication statusPublished - Feb 2012
Externally publishedYes


  • Galaxy: disc
  • Galaxy: stellar content
  • Galaxy: structure
  • ISM: general
  • Stars: general
  • Surveys

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