Peremennye Zvezdy

"Peremennye Zvezdy",
Prilozhenie
,
vol. 9, N 7 (2009)

New variable stars in Andromeda II

T. Kryachko#1, A. Samokhvalov#2, B. Satovskiy#1
#1. Astrotel Observatory, Karachay-Cherkessia, Russia;
#2. Surgut, Russia

Received:   7.02.2009;   accepted:   13.02.2009
(E-mail for contact: bredfild@mail.ru, sav@surgut.ru, bs25@mail.ru)


#NameOtherCoord (J2000)TypeMaxMinSystemPeriodEpoch (JD)typeSpCommentL.CurveFind.ChartData
1 USNO-A2.0 1275-0115482601 56 07.26, +44 01 18.2EW18.1818.83B0.29492454832.2245min Comm. 101_PC-B.png01_ch.jpg01_data.txt
2 USNO-A2.0 1275-0116234801 56 51.48, +44 05 35.6EA17.4218.33B2.13482454827.2226min Comm. 202_PC-B.png02_ch.jpg02_data.txt
3 USNO-A2.0 1275-0116692601 57 18.87, +44 29 21.1EA16.3717.22B1.03002454813.4417min Comm. 303_PC-B.png03_ch.jpg03_data.txt
4 USNO-A2.0 1275-0117832101 58 26.75, +44 44 53.2EW17.7118.58B0.26012454796.5420min Comm. 404_PC-B.png04_ch.jpg04_data.txt

Comments:


1. One observed primary minimum: HJD 2454832.2245. Min II = 18.80.

2. Two observed primary minima: HJD 2454799.4752, 2454827.2226. Min II = 18.20. A twice shorter period is possible.

3. One observed primary minimum: HJD 2454813.4417. Min II = 16.66.

4. Min II = 18.44:.

Remarks:
We started observing the field of the cataclysmic variable OT_J020025.4+441019 (Kryachko et al. 2008a) without filters (Kryachko et al. 2008b) and now continue the observing program using a B filter. In the course of these observations, we discovered 4 new faint eclipsing variable stars. Our observations were carried out at the Astrotel-Caucasus observatory using the 300-mm Ritchey-Chretien telescope, equipped with an Apogee Alta U9000 CCD camera and a B filter. A total of 484 images with 5-minute exposures were obtained on JD 2454796 - 2454833. For basic reductions for dark current, flat fields, and bias, we used MaxIm DL software. For search and photometry of new variable stars, we applied VaST software by Sokolovsky and Lebedev (2005). The comparison star was GSC 2828-01694 = TYC 2828 1694 1 (01:59:53.69, +44:06:10.7, J2000; B(T) = 12.081). The coordinates of the variable stars in the table were drawn from the 2MASS catalogue (Cutri et al. 2003). For search for periods and epochs of primary minima, we use Peranso software (www.peranso.com).

References:
Cutri, R.M., Skrutskie, M.F., van Dyk, S, et al., 2003, 2MASS All Sky Catalog of Point Sources, Centre de Donnees Astronomiques de Strasbourg, II/246
Kryachko, T., Korotkiy, S., Denisenko, D., Satovskiy, B., 2008a, vsnet-alert, 10478
Kryachko, T., Samokhvalov, A., Korotkiy, S., 2008b, PZP, 8, No. 48
Sokolovsky, K., Lebedev, A., 2005, in 12th Young Scientists' Conference on Astronomy and Space Physics, Kyiv, Ukraine, April 19-23, 2005, eds.: Simon, A.; Golovin, A., p.79



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