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S. Kiyota kindly sent us his time-series observations of TV Crv
on February 19, 21, 25, and 26. In light curves obtained by us and
S. Kiyota, we can see the object almost remained at a constant
brightness during the very early phase of this superoutburst
(February 18 and 19). In the S. Kiyota's light curve on February 19
the object seems to show short-term variations which probably
attribute to super-QPOs, as previously reported in the case of
the Kyoto observation (vsnet-campaign 786). The object was gradually
fading from February 20 with a rate of ~0.15mag/day until February 24
when the rate became very slow (0.05mag/day).
Superhumps have been prominent since February 20. The PDM period
analysis yields 0.065024 +/- 0.000008 day using all data points (N=1846)
since February 20. It is interesting that the early phase (February 20
- 22; N=1061) and the latter phase (February 24 - 27; N=785) show
0.064893 +/- 0.000023 day and 0.065167 +/- 0.000080 day periodicity,
respectively. This may imply the superhump period increasing in
a middle phase of a superoutburst, while the confidence level of the
latter periodicity is low. More observations at multiple longitudes
are encouraged.
Regards,
Makoto Uemura
Return to the Daisaku
vsnet-adm@kusastro.kyoto-u.ac.jp
