Time-related binary system characteristics such as orbital period, its rate of change, apsidal
motion, and variable light-time delay due to a third body, are measured in two ways that can …

We present new photometric data and LAMOST spectra for the W UMa binaries UV Lyn,
V781 Tau, NSVS 4484038, and 2MASS J15471055+ 5302107. The orbital and starspot …

New CCD photometric BVRI observations of the puzzling W UMa type binary star, TZ Bootis,
are presented from our observations in 2010. By using the updated version of the Wilson …

We present precision CCD photometry, a period study, and a two-color simultaneous Wilson
code solution of the short-period contact binary CK Bootis. The asymmetric light curves were …

New photometric observations and their investigation of the W UMa-type binary, BI CVn, are
presented. The variations of the orbital period were analyzed based on 12 new determined …

We present a detailed period analysis of TY Bootis, based on all available light minimum
times covering about 80 years. We discovered that there exists a cyclic variation overlaying …

With the aim of providing new and up-to-date absolute parameters of some close binary
systems, new BVR CCD photometry was carried out at the Ankara University Observatory …

New CCD four-color light curves of TY Boo made on eight nights over 2010–2011 were
analyzed in comparison with historical light curves obtained from 1969 through 2011. The …

Abstract Multi-color (B, V, R c, I c) CCD photometric light curves of the contact binary V502
Oph are analyzed using the Wilson–Devinney program. The solutions reveal that V502 Oph …

The light curve analyses and orbital period variations for two contact binary stars, LS Del
and V997 Cyg, are presented in this work which was conducted in the frame of the Binary …