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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 709714.0, MPI für Astronomie / Publikationen_mpia
Ultraviolet-excess sources with a red/infrared counterpart: low-mass companions, debris discs and QSO selection
Authors:Verbeek, K.; Groot, P. J.; Scaringi, S.; Casares, J.; Corral-Santana, J. M.; Deacon, N.; Drew, J. E.; Gänsicke, B. T.; González-Solares, E.; Greimel, R.; Heber, U.; Napiwotzki, R.; Østensen, R. H.; Steeghs, D.; Wright, N. J.; Zijlstra, A.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:Monthly Notices of the Royal Astronomical Society
Issue / Number:1
Start Page:2
End Page:13
Audience:Not Specified
Abstract / Description: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 &tilde;2-4 per cent of the white dwarfs have an M-dwarf companion, &tilde;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.
Free Keywords:surveys; binaries: general; white dwarfs; ISM: general; Galaxy: stellar content; infrared: stars
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0035-8711 %R 10.1093/mnras/stt1492
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