University of Hertfordshire

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  • 906757

    Accepted author manuscript, 1.03 MB, PDF document

  • K. Verbeek
  • Paul J. Groot
  • Simone Scaringi
  • Jorge Casares
  • Jesus M. Corral-Santana
  • Niall Deacon
  • J.E. Drew
  • B.T. Gänsicke
  • E. Gonzalez-Solares
  • R. Greimel
  • U. Heber
  • R. Napiwotzki
  • R.H. Ostensen
  • D. Steeghs
  • N.J. Wright
  • A. Zijlstra
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Original languageEnglish
Pages (from-to)2-13
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume438
Issue1
DOIs
Publication statusPublished - Feb 2014

Abstract

We present the result of the cross-matching between ultraviolet (UV)-excess sources selected from the UV-Excess Survey of the Northern Galactic Plane (UVEX) and several infrared (IR) surveys (2MASS, UKIDSS and WISE). From the position in the (J - H) versus (H - K) colour-colour diagram, we select UV-excess candidate white dwarfs with an M-dwarf type companion, candidates that might have a lower mass, brown-dwarf type companion and candidates showing an IR-excess only in the K band, which might be due to a debris disc. Grids of reddened DA+dM and sdO+MS/sdB+MS model spectra are fitted to the U, g, r, i, z, J, H, K photometry in order to determine spectral types and estimate temperatures and reddening. From a sample of 964 hot candidate white dwarfs with (g - r) <0.2, the spectral energy distribution fitting shows that ~2-4 per cent of the white dwarfs have an M-dwarf companion, ∼2 per cent have a lower-mass companion, and no clear candidates for having a debris disc are found. Additionally, from WISE six UV-excess sources are selected as candidate quasi-stellar objects (QSOs). Two UV-excess sources have a WISE IR-excess showing up only in the mid-IR W3 band of WISE, making them candidate luminous infrared galaxies (LIRGs) or Sbc starburst galaxies.

ID: 2823426