[vsnet-alert 13215] T Pyx: variations shorter than Porb!

Taichi Kato tkato at kusastro.kyoto-u.ac.jp
Thu Apr 21 09:34:57 JST 2011

T Pyx: variations shorter than Porb!

   We have received time-series photometry of T Pyx from Josch Hambsch
and Berto Monard.   The object is still in slowly rising phase.

   Most notably, Monard's observations seem to indicate the presence
of periodicity at 0.0737(1) d with mean amplitudes of 0.03 mag.
The signal appears to be coherent.  This periodicity is 3.3 % shorter
than the orbital period (0.076223 d).  If it were an accretion-disk
system, thie periodicity can be referred to as negative superhumps.
What is the cause of this unusual variation?

   Further follow-up observations are strongly encouraged.

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