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In the light curve obtained last night at Kyoto,
we can see some hints of modulations with an amplitude of 0.15mag,
but no clear superhump. The periodicity of 0.15mag modulations
looks shorter than 0.0555 day which is a superhump period previosly reported.
Using this three hours run, the PDM analysis yields a weak signal
around 0.0555 day and stronger periodicity around 0.036 day, but
of course, the base line is too short to obtain a high confidence
level.
We are now taking tonight's time-series run of DI UMa, and
have confirmed the object remains the brighteness. We expect that
superhump evolution in this peculiar system will be revealed through
tonight's or the next night observation, but it seems to become
cloudy from now in Kyoto. Follow-up observations are encouraged.
Regards,
Makoto Uemura
Return to the Powerful Daisaku
vsnet-adm@kusastro.kyoto-u.ac.jp
