New Variable Stars in Aquila

T. Kryachko^#1, A. Samokhvalov^#2, B. Satovskiy^#1

#1. Astrotel Observatory, Karachay-Cherkessia, Russia; #2. Surgut, Russia

Received:   3.09.2010;   accepted:   26.10.2010
(E-mail for contact: bredfild@mail.ru, sav@surgut.ru, bs25@mail.ru)

Comments:


1. Primary minimum: HJD(TT) 2455391.4159±0.0004. Min_II=16^m.40.

2. Maximum: HJD(TT) 2455387.4028±0.0005.

3. Primary minimum: HJD(TT) 2455391.4152±0.0009. Min_II=16^m.99.

4. Primary minimum: HJD(TT) 2455397.3972±0.0005. Period 0.4102 d is also possible.

5. Min_II=15^m.41.

6. Maximum: HJD(TT) 2455397.3961±0.0006.

Remarks:
During observations of the field in Aquila, we discovered six new variable stars. Our observations were carried out at the Astrotel-Caucasus observatory using the 300-mm Ritchey-Chretien telescope, equipped with an unfiltered Apogee Alta U9000 CCD camera. A total of 106 images with 5-minute exposures were obtained on JD 2455382 - 2455397. For basic reductions for dark current, flat fields, bias, and for removing cosmic-ray hits, we used IRAF routines. For search and photometry of new variable stars, we applied VaST software by Sokolovsky and Lebedev (2005). The comparison star was USNO-A2.0 0900-18617527 = USNO-B1.0 0904-0528702 (α=20^h30^m53^s.81, δ=+00°25′ 33″.7 J2000, 2MASS); R₁=14^m.24, R₂=14^m.44 (USNO-B1.0). Unfiltered magnitudes were calibrated using the comparison star, assuming R_comp=14^m.34. The coordinates of the variable stars in the table were drawn from the 2MASS catalogue (Skrutskie et al. 2006). For search for periods and epochs of extrema, we use Peranso software (www.peranso.com).

Acknowledgements: We would like to thank S. V. Antipin for helpful discussion.

References:
Skrutskie, M.F., Cutri, R.M., Stiening, R., et al., 2006, AJ, 131, 1163
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