V344 Ori : Long, bright outburst, but without superhumps

On January 15, R. Stubbings detected a relatively rare outburst of V344 Ori. The last outburst was reported in 1999 November (mv=14.0). This outburst outshined the GCVS maximum (14.2p) (vsnet-campaign 692). On January 16, M. Uemura reported a possible superhumps (vsnet-campaign 696), however these modulations however turned out to be more irregular rather than typical superhumps. T. Vanmunster performed 7.7 hours time-series photometry on January 16/17, and reported that there's indeed a 0.1 mag modulation, but it definitely doesn't look like a common superhump, being very irregular in shape and pattern (vsnet-campaign 698). From the data by VSNET collaboration team on January 16 - 19 (the Kyoto team, B. Martin, the Nyrola team, H. Boffin, J. Pietz, T. Vanmunster), M. Uemura reported that the object gradually faded with a rate of 0.08mag/d, and the modulations show a weak periodicity of 0.066 and 0.039 day, however their amplitudes is very variable between 0.02 - 0.1mag (vsnet-campaign 706). T. Vanmunster commented the similarity of the activity of V344 Ori to that of V405 Vul (vsnet-campaign 708). Following this, T. Kato also commented that EP Car also showed similar activity on 2000 February (vsnet-campaign 710). From M. Moilanen's CCD images taken on January 20, M. Uemura estimates B-V=0.271 and V-R=0.246 of V344 Ori using Henden's sequence. In the light curve on January 22/23 by B. Martin, we can see two maxima whose interval is about 3 - 4 hours, and shorter time-scale modulations are also seen (vsnet-campaign-dn 414). M. Uemura reported the object entered a rapid decline phase on January 24 (vsnet-campaign 713).

CCD image taken at Kyoto

CCD image provided by M. Moilanen

Other related articles: vsnet-campaign-dn 397, 396, 399, 402, 404, 406, 407, 410, 423, vsnet-campaign 699, 693, vsnet-campaign 700, 701, 702, 703, 704, 705, 707

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