[vsnet-campaign-dn 6623] AK Cnc superhump period

[Ivan Andronov]

AK Cnc superhump period.

We have detected superhumps with the period of 0.06441d(=-0.00062), an amplitude of 0.25m (range from 13.65 R  to 13.40 R) and an asymmetric 0.381. The initial epoch Eo=2455214.9911HJD (+-0.0004)
All parameters were calculated using the program FDCN (Andronov 1994, OAP 7, 49).
The statistically significant value of the degree of trigonometrical polynomial is s=2.
The light curve and its fit are attached.

HJD	                Rmag code
2455214.96639	13.637	VIR
2455214.97389	13.608	VIR
2455214.97649	13.563	VIR
2455214.97918	13.552	VIR
2455214.97918	13.552	VIR
2455214.97918	13.552	VIR
2455214.97918	13.552	VIR
2455214.98210	13.491	VIR
2455214.98470	13.455	VIR
2455214.98731	13.412	VIR
2455214.98995	13.408	VIR
2455214.99258	13.438	VIR
2455214.99518	13.428	VIR
2455214.99812	13.475	VIR
2455215.00085	13.510	VIR
2455215.00367	13.516	VIR
2455215.00628	13.531	VIR
2455215.00911	13.599	VIR
2455215.01189	13.587	VIR
2455215.01725	13.600	VIR
2455215.01986	13.641	VIR
2455215.02247	13.630	VIR
2455215.02507	13.636	VIR
2455215.02775	13.639	VIR
2455215.03033	13.646	VIR
2455215.03296	13.656	VIR
2455215.03557	13.656	VIR
2455215.03818	13.608	VIR
2455215.04076	13.576	VIR
2455215.04335	13.536	VIR
2455215.04594	13.517	VIR
 
   
Telescope: AP180 + SBIG STL-11000
Filter: Rc (clear), which is wider, but close to R-band:
Rc-R=-0.04(+-0.011)+0.083(+-0.024)*(V-R)
Exposure: 180s
Tzec Maun observatory, USA

Natalia Virnina
Department "High and Applied Mathematics"
Odessa National Maritime University
Odessa, Ukraine;
Institute of Mathematics, Economy and Mechanics
Odessa National University.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 25995 bytes
Desc: not available
URL: <http://ooruri.kusastro.kyoto-u.ac.jp/pipermail/vsnet-campaign-dn/attachments/20100118/18db9c62/attachment.jpeg>