[vsnet-outburst 7386] OT_J055718+683226: Superhump phase shift?
uemuram at hiroshima-u.ac.jp
uemuram at hiroshima-u.ac.jp
Mon Dec 25 23:04:51 JST 2006
OT_J055718+683226: Superhump phase shift?
This ultra-short period dwarf nova is still in a 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
Our observation on 22 Dec. indicates that superhumps dramatically
changed their profile and the secondary maxima of past superhumps
are now prominent.
http://home.hiroshima-u.ac.jp/hasc/kanata/j0557/index.html
As can be seen in the above page, the superhump phase has
apparently been shifted. A possible growth of the secondary maximum
is also seen in the light curve on 19 Dec.
Time-series observations are urged in order to study the nature
of this superhump evolution.
Regards,
Makoto Uemura and Akira Arai
Hiroshima University
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