Moscow Digital Variables. III

D. Kolesnikova^#1, K. V. Sokolovsky^#2,3, S. V. Antipin^#2,1, N. N. Samus^#1,2

#1. Institute of Astronomy, Russian Academy of Sciences; #2. Sternberg Astronomical Institute; #3. Astro Space Center of the Lebedev Physical Institute, Russian Academy of Sciences

Received:   24.09.2007;   accepted:   19.10.2007
(E-mail for contact: poocha@yandex.ru)

Comments:
1. NSVS data (Wozniak et al., 2004; also see http://skydot.lanl.gov/nsvs) confirms variability.

2. MinII 15.7.

3. GSC 2715-00971. MinII 14.5. A twice shorter period and type RRC are possible.

5. MinII 14.8.

6. MinII 15.7.

7. MinII 15.4.

Remarks:
We present new results of our pilot project of variable-star search using scanned photographic plates. The two square 1.5-to-1.5-degree regions in Cygnus studied in Kolesnikova et al. (2007) were re-examinated, with new findings made for that centered at 21h24m44s, +36deg21'51" (J2000). The observing material, as earlier, were 175 photographic plates taken with the 40-cm astrograph in Crimea in 1975 - 1995 and scanned by one of the authors (D. Kolesnikova) at 2540 dpi resolution with the Sternberg Institute's CREO EverSmart Supreme II flatbed scanner. Our analysis made use of the VAST software (Sokolovsky & Lebedev, 2005), based on the well-known SExtractor (Bertin, 2006). Numerous candidates were automatically checked for periodicity using a specially written code based on the Lafler & Kinman's period-search method. We also applied the period-search WinEffect software developed by V. Goranskij for the Windows environment. Seven previously unreported variable objects were discovered. Properties of these variable stars are presented in the Table above. The coordinates are from the USNO-A2.0 catalog (Monet et al., 1998).

Acknowledgements: We gratefully acknowledge financial support from the RFBR (grants 05-02-16289 and 05-02-16688) and from the Program of Support for Leading Scientific Schools of Russia.

References:
Bertin, E., 2006, "SExtractor v2.5 User's manual" (http://terapix.iap.fr/rubrique.php?id_rubrique=91/)
Kolesnikova, D., Sokolovsky, K.V., Samus, N.N., Antipin, S.V., 2007, PZP, 7, No. 3 (Moscow Digital Variables. II) Monet, D., Bird, A., Canzian, B., et al., 1998, USNO-A2.0, A Catalog of Astrometric Standards (U.S. Naval Observatory, Washington, DC)
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 (VAST: http://saistud.sai.msu.ru/vast)
Wozniak, P.R., Vestrand, W.T., Akerlof, C.W. et al., 2004, Astron. J., 127, 2436