CT Hya: Superoutburst in November

As reported by M. Simonsen on February 8, a bright outburst of the large-amplitude SU UMa-type dwarf nova, CT Hya (13.7mag) was detected (vsnet-campaign-dn 2107).  This star was claimed to be something intermediate between usual SU UMa stars and WZ Sge-type stars, see Nogami et al. 1996.  The duration of the outburst is so long that it was probably a superoutburst (vsnet-campaign-dn 2117, 2121, 2125, 2128).

As detected by R. Stubbings, CT Hya was in a superoutburst from November 11 (vsnet-campaign-dn 3020). The data on November 12 taken by K. Torii, indicated the emergence of superhumps (amplitude 0.10-0.15 mag). A period analysis yielded a substantially longer period than the previously determined superhump period (0.06643 d, Kato et al. 1999). This difference seems to indicate that the object was experiencing the early development stage of the superhumps (vsnet-campaign-dn 3027). The light curve on November 13 by K. Torii, clearly showed fully grown superhumps (amplitude 0.3-0.4 mag). Some QPO-like variations (time scales ~10 m) were superimposed (vsnet-campaign-dn 3030).  Superhumps were clearly detected on November 16 and 17 (vsnet-campaign-dn 3040). The superoutburst continued on November 22 (vsnet-campaign-dn 3044). The November 23 data clearly show a ~0.8 mag drop, indicating that the superoutburst has entered the rapid decline stage (vsnet-campaign-dn 3048).

Other articles:
vsnet-campaign-dn 3026, 3029, 3038, 3032, 3036, 3041

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