Collins, David J. and Wheatley, P. J.. (2010) X-ray observations of SU UMa throughout six outbursts. Monthly Notices of the Royal Astronomical Society, Vol.402 (No.3). pp. 1816-1823. ISSN 0035-8711

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Abstract

We present RXTE observations covering six normal outbursts of the dwarf nova SU UMa, the prototype of its class. The outbursts showed consistent X-ray behaviour with the X-ray count rate dropping suddenly by a factor of 4, and with evidence for a half-day delay between the optical rise and the X-ray suppression. In contrast to SS Cygni, an X-ray flux increase at the beginning of outburst was not observed, although it is expected from boundary-layer models. The X-ray flux was high and decreasing during quiescence, in conflict with the disc instability model. The X-ray spectrum of SU UMa was softer in outburst than during quiescence, and it was consistent with constant reflection.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Monthly Notices of the Royal Astronomical Society
Publisher:	Wiley
ISSN:	0035-8711
Official Date:	1 March 2010
Volume:	Vol.402
Number:	No.3
Number of Pages:	8
Page Range:	pp. 1816-1823
Identification Number:	10.1111/j.1365-2966.2009.16009.x
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	NASA/Goddard Space Flight Centre, STFC Studentship
URI:	http://wrap.warwick.ac.uk/id/eprint/6412

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