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Title: First XMM-Newton observations of a cataclysmic variable I: Timing studies of OY Car
Authors: Ramsay, G.
Poole, T.
Mason, K.
Breeveld, A.
Córdova, F.
Pandel, D.
West, J.
Priedhorsky, W.
Much, R.
Osborne, J.
Wheatley, P.
Potter, S.
First Published: Jan-2001
Publisher: EDP Sciences for European Southern Observatory (ESO)
Citation: Astronomy & Astrophysics, 2001, 365 (1)
Abstract: We present XMM-Newton observations of the eclipsing, disc accreting, cataclysmic variable OY Car which were obtained as part of the performance verification phase of the mission. The star was observed 4 days after an outburst and then again 5 weeks later when it was in a quiescent state. There is a quasi-stable modulation of the X-rays at $\sim$2240 s, which is most prominent at the lowest energies. We speculate that this may be related to the spin period of the white dwarf. The duration of the eclipse ingress and egress in X-rays is 20-30 s. This indicates that the bulk of the X-ray emission originates from the boundary layer which has a negligible height above the surface of the white dwarf. The eclipse profile implies a white dwarf of mass M1=0.9-1.1 $M_{\odot}$ and a secondary star of M2=0.08-0.11 $M_{\odot}$.
DOI Link: 10.1051/0004-6361:20000039
ISSN: 0004-6361
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2001 ESO. Reproduced with permission from Astronomy & Astrophysics, © ESO.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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