Maxted, P. F. L., Gänsicke, B. T. (Boris T.), Burleigh, Matthew R., Southworth, J. (John), Marsh, T. R., Napiwotzki, Ralf, Nelemans, G. and Wood, P. L.. (2009) A survey for post-common-envelope binary stars using GALEX and SDSS photometry star. Monthly Notices of the Royal Astronomical Society, Vol.400 (No.4). pp. 2012-2021. ISSN 0035-8711

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Abstract

We report the first results of our programme to obtain multi-epoch radial velocity measurements of stars with a strong far-ultraviolet excess to identify post-common-envelope binaries (PCEBs). The targets have been identified using optical photometry from Sloan Digital Sky Survey (SDSS) DR4, ultraviolet photometry from Galaxy Evolution Explorer (GALEX) GR2 and proper motion information from SDSS DR5. We have obtained spectra at two or more epochs for 36 targets. Three of our targets show large radial velocity shifts (> 50 km s-1) on a time-scale of hours or days and are almost certainly PCEBs. For one of these targets (SDSS J104234.77+644205.4) we have obtained further spectroscopy to confirm that this is a PCEB with an orbital period of 4.74 h and semi-amplitude K = 165 km s-1. Two targets are rapidly rotating K-dwarfs which appear to show small radial velocity shifts and have strong Ca ii H&K emission lines. These may be wind-induced rapidly rotating (WIRRing) stars. These results show that we can use GALEX and SDSS photometry to identify PCEBs that cannot be identified using SDSS photometry alone, and to identify new WIRRing stars. A more comprehensive survey of stars identified using the methods developed in this paper will lead to a much improved understanding of common envelope evolution.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Double stars -- Spectra, Cool stars, White dwarf stars, Ultraviolet stars
Journal or Publication Title:	Monthly Notices of the Royal Astronomical Society
Publisher:	Wiley-Blackwell Publishing, Inc
ISSN:	0035-8711
Date:	21 December 2009
Volume:	Vol.400
Number:	No.4
Number of Pages:	10
Page Range:	pp. 2012-2021
Identification Number:	10.1111/j.1365-2966.2009.15594.x
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	United States. National Aeronautics and Space Administration (NASA), National Science Foundation (U.S.) (NSF)
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URI:	http://wrap.warwick.ac.uk/id/eprint/16795

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