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Multiwavelength observations of the helium dwarf nova KL Dra through its outburst cycle

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Ramsay, G. (Gavin), Kotko, Iwona, Barclay, Thomas, Copperwheat, C. M., Rosen, S. (Simon), Jeffery, C. S., Marsh, T. R., Steeghs, D. (Danny), 1972- and Wheatley, Peter J.. (2010) Multiwavelength observations of the helium dwarf nova KL Dra through its outburst cycle. Monthly Notices of the Royal Astronomical Society, Vol.407 (No.3). pp. 1819-1825. ISSN 0035-8711

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Official URL: http://dx.doi.org/10.1111/j.1365-2966.2010.17019.x

Abstract

We present multiwavelength observations of the helium-dominated accreting binary KL Dra which has an orbital period of 25 min. Our ground-based optical monitoring programme using the Liverpool Telescope has revealed KL Dra to show frequent outbursts. Although our coverage is not uniform, our observations are consistent with the outbursts recurring on a time-scale of similar to 60 d. Observations made using Swift show that the outbursts occur with a similar amplitude and duration (2 weeks) at both UV and optical energies. Although KL Dra is a weak X-ray source, we find no significant evidence that the X-ray flux varies over the course of an outburst cycle. We can reproduce the main features of the 60-d outburst cycle using the disc instability model and a helium-dominated accretion flow. Although the outbursts of KL Dra are very similar to those of the hydrogen-accreting dwarf novae, we cannot exclude the fact that they are the AM CVn equivalent of WZ Sge-type outbursts. With outbursts occurring every similar to 2 months, KL Dra is an excellent target to study helium-dominated accretion flows in general.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Accretion (Astrophysics), Double stars, Stars, New, Cataclysmic variable stars, Ultraviolet stars, Dwarf novae
Journal or Publication Title:	Monthly Notices of the Royal Astronomical Society
Publisher:	Wiley-Blackwell Publishing, Inc
ISSN:	0035-8711
Date:	21 September 2010
Volume:	Vol.407
Number:	No.3
Number of Pages:	7
Page Range:	pp. 1819-1825
Identification Number:	10.1111/j.1365-2966.2010.17019.x
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Science and Technology Facilities Council (Great Britain) (STFC)
Related URLs:	Other Repository
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URI:	http://wrap.warwick.ac.uk/id/eprint/5130