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X-ray observations of SU UMa throughout six outbursts

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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. doi:10.1111/j.1365-2966.2009.16009.x ISSN 0035-8711.

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Official URL: http://dx.doi.org/10.1111/j.1365-2966.2009.16009.x

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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, Engineering and Medicine > Science > Physics
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Wiley
ISSN: 0035-8711
Official Date: 1 March 2010
Dates:
DateEvent
1 March 2010Published
Volume: Vol.402
Number: No.3
Number of Pages: 8
Page Range: pp. 1816-1823
DOI: 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

Data sourced from Thomson Reuters' Web of Knowledge

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