Volume 533, September 2011
|Number of page(s)||3|
|Section||Stellar structure and evolution|
|Published online||24 August 2011|
Swift observations of the March 2011 outburst of the cataclysmic variable NSV 1436: a probable dwarf nova
Dept. of Physics and Astronomy, University of Leicester,
2 American Association of Variable Star Observers, 49 Bay State Rd., Cambridge, MA 02138-1203, USA
3 XMM-Newton Science Operations Centre, ESAC, Apartado 78, 28691 Villanueva de la Cañada, Madrid, Spain
4 Astrophysics Research Institute, Liverpool John Moores University, Liverpool CH41 1 LDS, UK
5 American Astronomical Society
6 School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287-1404, USA
7 Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
8 INTEGRAL Science Operations Centre, ESAC, Apartado 78, 28691 Villanueva de la Cañada, Madrid, Spain
Received: 15 April 2011
Accepted: 24 July 2011
Aims. The March 2011 outburst of the poorly-studied cataclysmic variable NSV 1436 offered an opportunity to decide between dwarf nova and recurrent nova classifications.
Methods. We use seven daily observations in the X-ray and UV by the Swift satellite, together with AAVSO V photometry, to characterise the outburst and decline behaviour.
Results. The short optical outburst coincided with a faint and relatively soft X-ray state, whereas in decline to fainter optical magnitudes the X-ray source was harder and brighter. These attributes, and the modest optical outburst amplitude, indicate that this was a dwarf nova outburst and not a recurrent nova. The rapid optical fading suggests an orbital period below 2 h.
Key words: accretion, accretion disks / binaries: general / stars: dwarf novae / novae, cataclysmic variables / stars: individual: NSV 1436
© ESO, 2011
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