[vsnet-campaign-dn 5099] GW Lib: Summary of this season's obs. with KANATA

[Makoto Uemura]

GW Lib: Summary of this season's obs. with KANATA

It is now hard to monitor GW Lib at Higashi-Hiroshima observatory. 
At the end of the season for the great outburst, we put the V- and 
J-band light curves and the color (V-J) evolution to date at:

http://kanatatmp.blogspot.com/search/label/GW%20Lib

More than 100 days have past since the rapid fading from the 
superoutburst, the object is still gradually fading. 
The color is now almost constant at V-J~0.65. 
A remarkable feature is V-J colors just after the rapid fading 
(V-J~1.2), which are significantly redder than the recent ones.

Since the object has recently been almost at quiescence, 
there should have been a redder and brighter source just after 
the fading compared with those of the quiescent disk. 
This red phase, thus, indicates not only a low temperature, 
but also a large size of an accretion disk.  
Such a strange disk may be responsible for the long-lived 
late superhumps (cf. [vsnet-alert 9392] etc.).

Regards,
Makoto Uemura and Akira Arai
on behalf of the KANATA team