[vsnet-alert 9809] DO Dra: outburst, and now fading

[Makoto Uemura]

DO Dra: outburst, and now fading

We observed DO Dra whose rare outburst was reported in 
"baavss-alert" on 10 Jan.

We performed ~5 hours time-series photometry with 
a 25-cm telescope and a CCD camera (Rc filter). 
The resultant light curve can be seen at:

http://kanatatmp.blogspot.com/2008/01/do-dra-outburst.html

We can see fluctuations with a time-scale of a few tens 
of minutes and amplitudes of 0.1-0.2 mag, 
superimposed on a fading trend of 1.1 mag/day.

The object has already started fading. 
It is noteworthy that our preliminary analysis of 
multi-color data obtained with TRISPEC/KANATA shows 
a quite red color (V-J~0.9) while it is still 3-4 mag 
brighter than its quiescence.

Regards,
M. Uemura, A. Arai, and T. Yasuda
on behalf of the KANATA team
Hiroshima University