. (2012) Spectroscopic follow-up of ultraviolet-excess objects selected from the UVEX survey. Monthly Notices of the Royal Astronomical Society, Vol.426 (No.2). pp. 1235-1261. ISSN 0035-8711

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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) ≤ 0.7 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.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Stars, Galaxies -- Structure
Journal or Publication Title:	Monthly Notices of the Royal Astronomical Society
Publisher:	John Wiley & Sons Ltd.
ISSN:	0035-8711
Date:	2012
Volume:	Vol.426
Number:	No.2
Page Range:	pp. 1235-1261
Identification Number:	10.1111/j.1365-2966.2012.21615.x
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Nederlandse Organisatie voor Wetenschappelijk Onderzoek [Netherlands Organisation for Scientific Research] (NWO)
Grant number:	614.000.601 (NWO)
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URI:	http://wrap.warwick.ac.uk/id/eprint/51995

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