Superhump-like variation during the anomalous state of SU UMa
Department of Astronomy, Kyoto University, Kyoto 606-8502, Japan
Corresponding author: tkato@kusastro.kyoto-u.ac.jp
Received:
13
December
2001
Accepted:
20
December
2001
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 
d, which is 3.6σ longer than
the orbital period (0.07635 d) of this system. We attributed this
signal to superhumps, based on its deviation from the orbital period
and its characteristic profile. During this anomalous state of SU UMa,
normal outbursts were almost suppressed, in spite of relatively regular
occurrences of superoutbursts. We consider that an ensuing tidally
unstable state following the preceding superoutburst can be a viable
mechanism to effectively suppress normal outbursts, resulting in an
anomalously outbursting state.
Key words: accretion, accretion disks / novae, cataclysmic variables / stars: dwarf novae / stars: individual (SU UMa)
© ESO, 2002