[vsnet-alert 14902] TY PsA : the development of superhump period

[Ohshima]

TY PsA : the development of superhump period

 We have received observations of this object from
Okayama Univ. team, Akazawa-san, Kiyota-san, and Josch
Hambsch. O-C with these data shows that this object
showed stage A superhumps until Aug 25 and phase transition
A-B occurred after that. The superhump period of stage A 
is 0.08860(8) d that of stage B is 0.08781 (3)d. The
value of stage B superhump period do not conflict that
of 2008 superoutburst (0.087990 (17)d).
 Though the value of superhump period derivative is not
so clear, it seems that this object shows positive Pdot
in stage B. This is relatively a rare case for such a 
system with long orbital period.