[vsnet-alert 9189] OT_J055718+683226: rapid fading

[uemuram at hiroshima-u.ac.jp]

OT_J055718+683226: rapid fading

    Our tonight observation shows the object has just entered in 
a rapid fading phase from the superoutburst.

20061218.65324 15.170 0.004 V
20061219.70913 15.248 0.002 V
20061221.72843 15.503 0.004 V
20061222.74022 15.572 0.003 V
20061226.77578 15.862 0.015 V
20061227.80198 15.960 0.017 V
20061230.55498 16.978 0.018 V

    Combined with observations by Maehara-san, the data indicates 
that the rapid fading began between 29-30 Dec.  Superhumps 
can be seen in his data on 29 Dec, just before the rapid fading.  

    http://home.hiroshima-u.ac.jp/hasc/kanata/j0557/index.html

    If this object is a WZ Sge-type dwarf nova, we can expect 
rebrightenings in the next week.  Follow-up observations are 
quite important in order to reveal the nature of this ultra-short 
period dwarf nova.

Regards,
Makoto Uemura
Hiroshima University