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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
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: |
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| 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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