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Paper: Magnetic and Color Variability of the Ap Star GY And
Volume: 494, Physics and Evolution of Magnetic and Related Stars
Page: 97
Authors: Metlova, N. V.; Bychkov, V. D.; Bychkova, L. V.; Madej, J.
Abstract: We present the results of photometric and magnetic monitoring of a well-known long-period Ap star GY And. This research was inspired by the unusual “secular” variability of the B–V color index. Photometric monitoring was carried out with the 60-cm reflector of the Crimean Laboratory of the Moscow State University, where 420 brightness estimates were obtained over 2011–2014 with the Johnson system broadband U, B, and V filters. Magnetic monitoring was carried out at the 1-m telescope of the Special Astrophysical Observatory. The duration of the photometric observations is about 54 years, while the duration of magnetic monitoring is 64 years. As a result, we have refined the period and the parameters of magnetic and photometric variability. We demonstrate that peculiar “secular” color variability is explained by the off-duty factor of the observations.
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