Abstract
Photoelectric BV observations of W UMa-type binaries CK Boo, BI CVn, and AH Vir are presented, and light curve variations and shifts of minima are discussed in the context of stellar activity and mass transfer. The O−C increments in three systems were found to be 0.08, 0.80, and 0.60 s per revolution, respectively. The new ephemeris for the future observations were also found.
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Demircan, O. BV observations of W UMa-type binaries: CK Boo, BI CVn, and AH Vir. Astrophys Space Sci 135, 169–174 (1987). https://doi.org/10.1007/BF00644471
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DOI: https://doi.org/10.1007/BF00644471