Free access article

A&A 396, 929-932 (2002)
DOI: 10.1051/0004-6361:20021435

Two X-ray bright cataclysmic variables with unusual activities: GZ Cnc and NSV 10934

T. Kato¹, P. A. Dubovsky², R. Stubbings³, M. Simonsen⁴, H. Yamaoka⁵, P. Nelson⁶, B. Monard⁷, A. Peaece⁸ and G. Garradd<sup>9

1</sup>  Department of Astronomy, Kyoto University, Kyoto 606-8502, Japan
²  MEDUZA group, Vedecko-kulturne centrum na Orave, 027 42 Podbiel 194, Slovakia
³  19 Greenland Drive, Drouin 3818, Victoria, Australia
⁴  46394 Roanne Drive Macomb, MI 48044, USA
⁵  Faculty of Science, Kyushu University, Fukuoka 810-8560, Japan
⁶  RMB 2493, Ellinbank 3820, Australia
⁷  Bronberg Observatory, PO Box 11426, Tiegerpoort 0056, South Africa
⁸  32 Monash Ave, Nedlands, WA 6009, Australia
⁹  PO Box 157, NSW 2340, Australia

(Received 29 August 2002 / Accepted 1 October 2002 )

Abstract
We report on a discovery of unexpected activities in two X-ray bright dwarf novae. GZ Cnc showed an anomalous clustering of outbursts in 2002, in contrast to a low outburst frequency in the past record. The activity resembles an increased activity seen in some intermediate polars or candidates. We identified NSV 10934, X-ray selected high-amplitude variable star, as a dwarf nova with unusually rapid decline. The outburst characteristics make NSV 10934 a twin of recently discovered intermediate polar (HT Cam) with dwarf nova-type outbursts. We propose that these activities in X-ray strong dwarf novae may be a previously overlooked manifestation of outburst activities in magnetic cataclysmic variables.

Key words: accretion, accretion disks -- novae, cataclysmic variables -- stars: dwarf novae -- stars: individual: GZ Cnc, NSV 10934

Offprint request: T. Kato, tkato@kusastro.kyoto-u.ac.jp

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© ESO 2002

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