TY - JOUR
T1 - Spectroscopic follow-up of ultraviolet-excess objects selected from the UVEX survey
AU - Verbeek, Kars
AU - Groot, Paul J.
AU - Scaringi, Simone
AU - Napiwotzki, Ralf
AU - Spikings, Ben
AU - Østensen, Roy H.
AU - Drew, Janet E.
AU - Steeghs, Danny
AU - Casares, Jorge
AU - Corral-Santana, Jesus M.
AU - Corradi, Romano L.M.
AU - Deacon, Niall
AU - Drake, Jeremy J.
AU - Gänsicke, Boris T.
AU - González-Solares, Eduardo
AU - Greimel, Robert
AU - Heber, Ulrich
AU - Irwin, Mike J.
AU - Knigge, Christian
AU - Nelemans, Gijs
PY - 2012/10/21
Y1 - 2012/10/21
N2 - We present the results of the first spectroscopic follow-up of 132 optically blue ultraviolet (UV)-excess sources selected from the UV-Excess Survey of the Northern Galactic Plane (UVEX). The UV-excess spectra are classified into different populations and grids of model spectra are fitted to determine spectral types, temperatures, surface gravities and reddening. From this initial spectroscopic follow-up 95 per cent of the UV-excess candidates turn out to be genuine UV-excess sources such as white dwarfs, white dwarf binaries, subdwarf types O and B, emission-line stars and quasi stellar objects. The remaining sources are classified as slightly reddened main-sequence stars with spectral types later than A0V. The fraction of DA white dwarfs is 47 per cent with reddening smaller than E(B - V) ≤ 0.7mag. Relations between the different populations and their UVEX photometry, Galactic latitude and reddening are shown. A larger fraction of UVEX white dwarfs is found at magnitudes fainter than g > 17 and Galactic latitude smaller than |b| < 4 compared to main-sequence stars, blue horizontal branch stars and subdwarfs.
AB - We present the results of the first spectroscopic follow-up of 132 optically blue ultraviolet (UV)-excess sources selected from the UV-Excess Survey of the Northern Galactic Plane (UVEX). The UV-excess spectra are classified into different populations and grids of model spectra are fitted to determine spectral types, temperatures, surface gravities and reddening. From this initial spectroscopic follow-up 95 per cent of the UV-excess candidates turn out to be genuine UV-excess sources such as white dwarfs, white dwarf binaries, subdwarf types O and B, emission-line stars and quasi stellar objects. The remaining sources are classified as slightly reddened main-sequence stars with spectral types later than A0V. The fraction of DA white dwarfs is 47 per cent with reddening smaller than E(B - V) ≤ 0.7mag. Relations between the different populations and their UVEX photometry, Galactic latitude and reddening are shown. A larger fraction of UVEX white dwarfs is found at magnitudes fainter than g > 17 and Galactic latitude smaller than |b| < 4 compared to main-sequence stars, blue horizontal branch stars and subdwarfs.
KW - Galaxy: disc
KW - Galaxy: stellar content
KW - ISM: general
KW - Subdwarfs
KW - Surveys
KW - White dwarfs
UR - http://www.scopus.com/inward/record.url?scp=84867055619&partnerID=8YFLogxK
U2 - 10.1111/j.1365-2966.2012.21615.x
DO - 10.1111/j.1365-2966.2012.21615.x
M3 - Article
AN - SCOPUS:84867055619
VL - 426
SP - 1235
EP - 1261
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 2
ER -