%0 Journal Article
%T Spectroscopic follow-up of UV-excess objects selected from the UVEX survey
%A Kars Verbeek
%A Paul J. Groot
%A Simone Scaringi
%A Ralf Napiwotzki
%A Ben Spikings
%A Roy H. £¿stensen
%A Janet Drew
%A Danny Steeghs
%A Jorge Casares
%A Jesus M. Corral-Santana
%A Romano Corradi
%A Niall Deacon
%A Jeremy Drake
%A Boris T. Gansicke
%A Eduardo Gonz¨¢lez-Solares
%A Robert Greimel
%A Ulrich Heber
%A Mike Irwin
%A Christian Knigge
%A Gijs Nelemans
%J Physics
%D 2012
%I arXiv
%R 10.1111/j.1365-2966.2012.21615.x
%X We present the results of the first spectroscopic follow-up of 132 optically blue 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 fit to determine spectral types, temperatures, surface gravities and reddening. From this initial spectroscopic follow-up 95% of the UV-excess candidates turn out to be genuine UV-excess sources such as white dwarfs, white dwarf binaries, subdwarfs type O and B, emission line stars and QSOs. 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% with reddening smaller than E(B-V)<0.7 mag. Relations between the different populations and their UVEX photometry, Galac- tic 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.
%U http://arxiv.org/abs/1206.7012v1