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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…
First detection of the growing humps at the rapidly rising stage of dwarf novae AL Com and WZ Sge
Ryoko Ishioka, Makoto Uemura, Katsura Matsumoto +11
We report on time-series photometric observations in the earliest stages of superoutbursts of the extreme dwarf novae, AL Com and WZ Sge, which started on 2001 May after the 6 year…
V2487 Ophiuchi: A strong candidate for a recurrent nova and a progenitor of Type Ia supernova
Izumi Hachisu, Mariko Kato, Taichi Kato +1
The light curve of the 1998 outburst of V2487 Ophiuchi (Nova Oph 1998) shows a very rapid decline (t_3 ~ 9 day) and a mid-plateau phase from 10 to 30 days after the optical maximum…
1998 Superoutburst of the Large-Amplitude SU UMa-Type Dwarf Nova WX Ceti
Taichi Kato, Katsura Matsumoto, Daisaku Nogami +2
We observed the 1998 November superoutburst of WX Cet, a dwarf nova originally proposed as a WZ Sge-like system. The observation established that WX Cet is an SU UMa-type dwarf nov…