TY - JOUR
T1 - Ultraviolet-excess sources with a red/infrared counterpart
T2 - Low-mass companions, debris discs and QSO selection
AU - Verbeek, Kars
AU - Groot, Paul J.
AU - Scaringi, Simone
AU - Casares, Jorge
AU - Corral-Santana, Jesus M.
AU - Deacon, Niall
AU - Drew, Janet E.
AU - Gänsicke, Boris T.
AU - González-Solares, Eduardo
AU - Greimel, Robert
AU - Heber, Ulrich
AU - Napiwotzki, Ralf
AU - østensen, Roy H.
AU - Steeghs, Danny
AU - Wright, Nicholas J.
AU - Zijlstra, Albert
PY - 2014/2
Y1 - 2014/2
N2 - 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.
AB - 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.
KW - Binaries: general
KW - Galaxy: stellar content
KW - ISM: general
KW - Infrared: stars
KW - Surveys
KW - White dwarfs
UR - http://www.scopus.com/inward/record.url?scp=84892501907&partnerID=8YFLogxK
U2 - 10.1093/mnras/stt1492
DO - 10.1093/mnras/stt1492
M3 - Article
AN - SCOPUS:84892501907
SN - 0035-8711
VL - 438
SP - 2
EP - 13
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -