|#1. Siberian State Aerospace University, Krasnoyarsk, Russia;
#2. Institute of Astronomy, Russian Academy of Sciences, Moscow, Russia
#3. Sternberg Astronomical Institute, Lomonosov Moscow State University, Moscow, Russia;
Received: 1.07.2014; accepted: 20.07.2016
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We restudied a field in Lacerta (Lapukhin et al. 2013) and found 25 small amplitude variable stars. Unfortunately we missed these objects while investigating the area for the first time. The observations were performed at the observatory of the Siberian State Aerospace University with a Hamilton telescope (D = 400 mm, F = 915 mm) equipped with an FLI ML9000 CCD chip (3056 × 3056 pixels, pixel size 12 μm). All CCD observations are unfiltered and were obtained from August to November 2012. Exposure times were 30 seconds for all frames. The size of the field is 2°.3 × 2°.3.
The magnitudes were referred to red magnitudes of comparison stars from the USNO-A2.0 catalog (Monet et al. 1998).
We used VaST (Sokolovsky & Lebedev 2005) software to search for new variable stars.
To find periods, we applied WinEfk software provided by Dr. V.P. Goranskij.
Acknowledgements: The authors wish to thank Dr. V.P. Goranskij for providing his period-search software and Dr. K.V. Sokolovsky for providing VaST (a software package for detection of variable objects on a series of astronomical images). This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the UMass/IPAC-Caltech, funded by the NASA and the NSF, and the Aladin interactive sky atlas, operated at CDS, Strasbourg, France.
Lapukhin, E. G., Veselkov, S. A., Zubareva A. M., 2013, Perem. Zvezdy Prilozh., 13, No. 12
Monet, D., Bird, A., Canzian, B., et al., 1998, USNO-A2.0, A Catalog of Astrometric Standards (U.S. Naval Observatory, Washington, DC), Centre de Données Astronomiques de Strasbourg, I/252
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