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"Peremennye Zvezdy", Prilozhenie, vol. 7, N 29 (2007)

GSC 2050-00745: Four Years of Observations

S. V. Antipin^#1,2, K. V. Sokolovsky^#1,3

#1 Sternberg Astronomical Institute, Moscow State University; #2 Institute of Astronomy, Russian Academy of Sciences; #3 Astro Space Center, Lebedev Physical Institute, Russian Academy of Sciences

ISSN 2221–0474

Received:   12.11.2007;   accepted:   12.11.2007
(E-mail for contact: antipin@sai.msu.ru, idkfa@sai.msu.ru)

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Star Name: GSC 2050-00745 Coordinates (J2000): 16 18 34.35, +27 28 13.3 Variability type: RRAB, Blazhko effect;   Limits, System: 0.58 - 1.92 (delta V);     Period: 0.508648 d;   Epoch(max): JD 2453558.37

Remarks:

Our observations of GSC 2050-00745, an RRAB type variable star with strong Blazhko effect (Antipin et al., 2005), have been continued. Our CCD photometry was carried out at the Crimean Laboratory, Sternberg Astronomical Institute, using a Pictor 416XTE camera at the 50-cm reflector in 2006 and a SBIG ST2000XM CCD camera at the 60-cm reflector in 2007. 127 V-band brightness measurements were obtained on two nights in 2006: July 25 - 26, JD2453942-43; and 218 measurements, on three nights in 2007: July 11 - 16, JD2454293-98. The images were dark subtracted, flat-fielded and analyzed with the aperture photometry package developed by V.P. Goranskij. GSC 2050-00597 was used for comparison. The phased light curve is given in the Figure. The V-band amplitude of pulsations changes from 0.57m in 2006 to 1.34m in 2005. Unfortunately, the Blazhko period still remains unknown. Acknowledgments: The authors thank S. Korotkiy and Ka-Dar Public Observatory for providing equipment for our observing run in 2007. We are grateful to the Russian Foundation for Basic Research (grants Nos. 05-02-16688 and 05-02-16289) for partial support of this study.

References:

Antipin, S.V., Sokolovsky, K.V., Lebedev, A.A., 2005, IBVS, No. 5654