[vsnet-campaign-dn 560] TV Crv: superhump period revised

[Makoto Uemura <uemura@kusastro.kyoto-u.ac.jp>]

    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

VSNET Home Page

---

vsnet-adm@kusastro.kyoto-u.ac.jp

VSNET Home Page

Return to Daisaku Nogami

---

vsnet-adm@kusastro.kyoto-u.ac.jp