KV Dra: Rare, Faint Superoutburst in September

The SU UMa-type dwarf nova KV Dra (RX J1450.5+6403) was reported to be in outburst on August 31. The object underwent an superoutburst in 2000 May (see vsnet-alert 4858 and Nogami et al. 2000 A&A 364, 701). However, only two normal outbursts had been reported since then. The outburst frequency of this object may be low (vsnet-campaign-dn 2767, 2768). T. Kato reported superhumps detected by A. Oksanen, J. Pietz, D. Starkey, and L. Cook. This outburst was hence a rare faint superoutburst.

In addition to the superhump variation, short-term variations, which could be related to super-QPOs, were also observed (vsnet-campaign-dn 2777, 2778, 2785). D. Nogami reported a superhump period of 0.0596(+-0.0008) d, same as that reported in Nogami et al. (2000, A&A, 364, 701) within the error (vsnet-campaign-dn 2787). Using data sets obtained by the VSNET Collaboration team, M. Uemura reported that the superhump period was slightly shorter than the previous one during the very early phase of superoutburst (0.059948(27) d in [vsnet-campaign-dn 2792], 0.059916(20) d in [vsnet-campaign-dn 2796]). Then the superhump period started increasing from September 5 (0.060005(17) d in [vsnet-campaign-dn 2802], 0.060121(25) d in [vsnet-campaign-dn 2814]).

The superoutburst continued until September 11, when K. Torii detected a rapid fading (vsnet-campaign-dn 2831, 2839, 2841). Superhumps were very small or non-existent in the light curve on September 11 observed by A. Oksanen (vsnet-campaign-dn 2847).  T. Kato commented that the evolution of the superhumps resembles that of V1028 Cyg, as has been expected from the similarity in their orbital periods and outburst properties (vsnet-campaign-dn 2875).

Other articles:
vsnet-campaign-dn 2780, 2788, 2789, 2791, 2802, 2805, 2807, 2815, 2820


Time-series observations by G. Billings:
[vsnet-campaign-data 102]

 Light curve by the Nyrola team:
[vsnet-campaign-dn 2793]
[vsnet-campaign-dn 2805]
 [vsnet-campaign-dn 2847]

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