Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/17925
Title: Detection of a new white-dwarf binary system in the extreme ultraviolet using the Rosat Wide Field Camera
Authors: COOKE, B. A.
BARSTOW, M. A.
BREEVELD, E. R.
CHARLES, P. A.
GOODALL, C. V.
GOURLAY, J. A.
HASSALL, B. J. M.
HUCKLE, H. E.
KENT, B. J.
PYE, J. P.
RICHARDS, A. G.
SIMS, M. R.
SUMNER, T. J.
WATSON, M. G.
WELLS, A.
WILLINGALE, R.
WRIGHT, J. S.
First Published: 2-Jan-1992
Publisher: Nature Publishing Group
Citation: Nature, 1992, 355 (6355), pp. 61-63
Abstract: DETAILED understanding of the evolution of main-sequence stars into white dwarfs depends on knowledge of the chemical composition of white-dwarf atmospheres, but the hottest white dwarfs emit much of their radiation in the extreme ultraviolet (EUV), a part of the spectrum that has been generally inaccessible to astronomers. We report here the discovery of a new white dwarf as a bright EUV source found during the first observations using the Wide Field Camera1 on the Rosat satellite. Within the 1-arcmin error box of the EUV source is an unusually blue star, which we show to be a binary system consisting of a DA white dwarf and a cool companion in the classification range dM2–dM5. There are some similarities between this new object and the binary system Feige 24 (ref. 2), but spectral differences in the EUV emission can be attributed to significantly different atmospheric compositions for the two white dwarfs.
DOI Link: 10.1038/355061a0
ISSN: 0028-0836
Links: http://hdl.handle.net/2381/17925
http://www.nature.com/nature/journal/v355/n6355/abs/355061a0.html
Type: Journal Article
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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