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CCD Observations and Period Change of the Type ab RR Lyrae Star DV Mon

Dambis, A. K.; Berdnikov, L. N.; Kniazev, A. Yu. +3 more

We took a total of 635 B-, V-, and I_c-band CCD frames for the RRab Lyr type variable DVMon, which has a close bright visual companion with a separation of about 1.9'. Observations were made with the 76-cm telescope of the South African Astronomical Observatory (SAAO, South Africa) using SBIG CCD ST-10XME. For the first time, we obtained…