[vsnet-alert 13303] 10-min variability of V1363 Cyg

[Ivan Andronov]

10-min variability of V1363 Cyg

The star was observed remotely using the PIRATE (pirate.open.ac.uk) 17-inch telescope with R filter. 
The light curve is shown at http://uavso.org.ua/curves/v1363Cyg.gif
with a sine approximation and 1*sigma and 2*sigma error corridors.
As there is no R standard for this field at the AAVSO chart 
( aavso.org/vsp ), we made a differential photometry is shown in respect to the star 145 
(B=15.265(0.022), V=14.497(0.012), Rc=14.086(0.050)). 
The mean brightness <Var-Comp>=14.086-0.502(4)=13.584(4) mag.


The periodogram was computed using the same trigonometric polynomial fit of order 1 (1994OAP.....7...49A) 
implemented in the program MCV (Andronov, Baklanov, http://uavso.pochta.ru/mcv).
The periodogram is shown at  http:/uavso.org.ua/curves/v1363Cyg-p.gif

The peak at the periodogram corresponds to the period P=0.00699 d (Max JD=2455691.43961+-0.00037), 
which is close to that reported in 
[vsnet-alert 13294] by Enrique de Migeul (P=0.00732(15)d=10.54 minutes and 0.101(6)d)
but differs by 14% from that in
[vsnet-alert 13296] by Jan Miller (P=0.00593(4)d=8.54 minutes, amplitude 0.05 mag).

Our peak, as well as that published in these VSNET - circulars, are marked at this figure.

For our observations, the semi-amplitude is 0.016(5) mag, less than reported by Jan Miller.


Ivan L. Andronov, Vitalii V. Breus
Dept "High and Applied Mathematics"
Odessa National Maritime University, Ukraine

Ulrich Kolb 
Dept of Physics & Astronomy 
The Open University, UK