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

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        904936.pdf (PDF, 3Mb)
        Author
        Verbeek, K.
        Groot, P.J.
        Scaringi, S.
        Nelemans, G.
        Napiwotzki, R.
        Spikings, B.
        Drew, J.E.
        Østensen, R.H.
        Steeghs, D.
        Gänsicke, B.T.
        Casares, J.
        Corral-Santana, J.M.
        Corradi, R.L.M.
        Deacon, Niall
        Drake, J.J.
        González-Solares, E.
        Irwin, M.J.
        Greimel, R.
        Heber, U.
        Knigge, C.
        Attention
        2299/10983
        Abstract
        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.
        Publication date
        2012-10-21
        Published in
        Monthly Notices of the Royal Astronomical Society
        Published version
        https://doi.org/10.1111/j.1365-2966.2012.21615.x
        Other links
        http://hdl.handle.net/2299/10983
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