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Suppression of X-rays during an optical outburst of the helium dwarf nova KL Dra

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Ramsay, Gavin, Wheatley, P. J., Rosen, Simon, Barclay, Thomas and Steeghs, D. (2012) Suppression of X-rays during an optical outburst of the helium dwarf nova KL Dra. Monthly Notices of the Royal Astronomical Society, Volume 425 (Number 2). pp. 1486-1491. doi:10.1111/j.1365-2966.2012.21660.x

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Official URL: http://dx.doi.org/10.1111/j.1365-2966.2012.21660.x

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Abstract

KL Dra is a helium-accreting AM CVn binary system with an orbital period close to 25 min. Approximately every 60 d there is a 4-mag optical outburst lasting ∼10 d. We present the most sensitive X-ray observations made of an AM CVn system during an outburst cycle. A series of eight observations were made using XMM–Newton which started shortly after the onset of an optical outburst. We find that X-rays are suppressed during the optical outburst. There is some evidence for a spectral evolution of the X-ray spectrum during the course of the outburst. A periodic modulation is seen in the ultraviolet data at three epochs – this is a signature of the binary orbital or the superhump period. The temperature of the X-ray-emitting plasma is cooler compared to dwarf novae, which may suggest that a wind is the origin of a significant fraction of the X-ray flux.

Item Type: Journal Article
Divisions: Faculty of Science > Physics
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Wiley
ISSN: 0035-8711
Official Date: 1 September 2012
Dates:
DateEvent
1 September 2012Published
Volume: Volume 425
Number: Number 2
Page Range: pp. 1486-1491
DOI: 10.1111/j.1365-2966.2012.21660.x
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access

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