Journal Article

Spectroscopic follow-up of ultraviolet-excess objects selected from the UVEX survey

Kars Verbeek, Paul J. Groot, Simone Scaringi, Ralf Napiwotzki, Ben Spikings, Roy H. Østensen, Janet E. Drew, Danny Steeghs, Jorge Casares, Jesus M. Corral-Santana, Romano L. M. Corradi, Niall Deacon, Jeremy J. Drake, Boris T. Gänsicke, Eduardo González-Solares, Robert Greimel, Ulrich Heber, Mike J. Irwin, Christian Knigge and Gijs Nelemans

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 426, issue 2, pages 1235-1261
Published in print October 2012 | ISSN: 0035-8711
Published online October 2012 | e-ISSN: 1365-2966 | DOI:
Spectroscopic follow-up of ultraviolet-excess objects selected from the UVEX survey

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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(BV) ≤ 0.7 mag. 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.

Keywords: surveys; subdwarfs; white dwarfs; ISM: general; Galaxy: disc; Galaxy: stellar content

Journal Article.  9164 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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