[vsnet-alert 9150] OT_J102146.4+234926: rebrightening phase?

[uemuram at hiroshima-u.ac.jp]

OT_J102146.4+234926: rebrightening phase?

    The new WZ Sge-type candidate, OT_J102146.4+234926 (=Var 06 Leo; 
CBET 746, vsnet-alert 9137) is now probably in a rebrightening phase.  

    We observed this object on 21 and 27 Nov. and also now 
observing with a 25-cm telescope at Higashi-Hiroshima Observatory.  
Our observations yield:

Nov. 21.83438   14.420 +/- 0.005 C   superhumps detected
Nov. 27.81359   16.036 +/- 0.007 C   faded
Nov. 28.33461   14.840 +/- 0.006 C   rebrightening !

Those observations indicate that the object had entered in 
a rapid fading phase from the last superoutburst, probably 
between Nov. 24-26 (based on AAVSO database, it was still bright 
on Nov. 23), and then, experienced, at least, one rebrightening, 
which is now observed.

Rebrightenings just after superoutbursts are often observed 
in WZ Sge-type dwarf novae, while their mechanism is poorly 
understood.  Observations of superhumps/late superhumps give 
us the information about the temporal evolution of an outer 
accretion disk. Following time-series observations are encouraged.

Regards,
Makoto Uemura and Akira Arai
Hiroshima University, Japan