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Superhump-like variation during the anomalous state of SU UMa
Taichi Kato
We observed an anomalously outbursting state of SU UMa which occurred in 1992. Time-resolved photometry revealed the presence of signals with a period of 0.0832 +/- 0.0019 d, which…
Spiral Structure in WZ Sagittae around the 2001 Outburst Maximum
Hajime Baba, Kozo Sadakane, Yuji Norimoto +6
Intermediate resolution phase-resolved spectra of WZ Sge were obtained on five consecutive nights (July 23 -- 27) covering the initial stage of the 2001 superoutburst. Double-peake…
Changing Supercycle of the ER UMa-Type Star V1159 Ori
Taichi Kato
We examined the VSNET light curve of the ER UMa-type star V1159 Ori. We detected a large variation of the supercycle (the interval between successive superoutbursts) between extrem…
The 1996-1997 Fading of V651 Mon, the Binary Central Star of the Planetary Nebula NGC 2346
Taichi Kato, Daisaku Nogami, Hajime Baba
V651 Mon is the binary central star of the bipolar planetary nebula NGC 2346. The star showed the second-ever deep fading in 1996-1997, which was presumably caused by obscuration b…
Detection of an Eclipse during the 1987 Outburst of U Sco
Taichi Kato
U Sco is a recurrent nova which showed recorded outbursts in 1863, 1906, 1936, 1979, 1987, and most recently in 1999. The eclipsing nature of the object was discovered after the 19…
Reanalysis of Ichinohe's Observations of RU Cam
Taichi Kato, Seiichi Sakuma
The W Vir-type variable star, RU Cam, once claimed to have stopped pulsation, has been known to show irregularly variable amplitude. It has also shown from the analysis of the VSOL…