Superoutburst of RZ Sge

(vsnet-alert 495)

The SU UMa-type dwarf nova RZ Sge is apparently undergoing a superoutburst as indicated by the following observations extracted from vsnet-obs reports.

1996 Aug.
           2.950   <14.5  J. S. Day
           3.016   <14.5  G. Poyner
           3.959   <14.5  J. S. Day
           3.974   <15.3  M. Biesmans
           4.958   <14.5  J. S. Day (VSNET seq.)
           4.975   <14.0  G. Poyner
           5.0229   14.5  M. Biesmans (AAVSO seq.)
           5.0292   13.9  M. Biesmans (VSNET seq.)
           5.86     12.1  J. Pietz
           5.9451   12.2  M. Biesmans (AAVSO seq.)

Since the outburst was caught during the very early stage of the outburst, observataions of the early development of superhumps (and maybe searches for super-QPOs) might be fruitful. The last reported outburst of this dwarf nova occurred on 1995 Oct. 21.

Taichi Kato

Detection of superhumps

(vsnet-obs 3346, Hajime Baba)

Dear Colleague,

We observed RZ Sge in V-band on August 7 with a CCD at Ouda Station, Kyoto University. The result gives us that the superhump with an amplitude of 0.2 mag was detected in the lightcurve. Thus this outburst seems to be a superoutburst.

Continuous observations are encourged.

Independet detection of superhumps by T. Vanmunster

(vsnet-obs 3355)

Dear colleagues,

Unfiltered CCD observations of RZ Sge done on August 8/9, 1996 at the CBA Belgium (during a 5.5 hours run), using an ST-7 SBIG CCD camera attached to a 25-cm f/6.3 SCT, show the existence of prominent superhumps. 2 * 2 on-chip summation was used, with exposure times of 70 sec and a dead-time of 10 sec throughout the observations.

Preliminary data reduction using the Phase Dispersion Minimization (PDM) method of R.F. Stellingwerf yields a superhump period of 0.071 d (= 102.3 min). The superhump amplitude was approx. 0.3 mag.

Kind regards,
Tonny Vanmunster
CBA Belgium

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