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Orbital period changes of the eclipsing binaries GO Cyg and GW Cep are explained by the light-time effect for the first time. New minima of the eclipsing binary AR Aur improve the predicted light-time orbit. The light-time orbit with the quadratic ephemeris of the binary matches the new observations of V505 Sgr better than the linear one. As the light-time effect fits in corresponding O − C diagrams of all four systems have been reaching extreme values, the observations of minima times in forthcoming years are highly desirable. [ABSTRACT FROM AUTHOR]

The first complete CCD BVRI-filter light curves of the eclipsing near-contact binary V387 Cyg were obtained during 5 nights in 2004 at Kryoneri Observatory, Greece. Their analysis with the W-D program indicates a semi-detached configuration with possible cool spots, although no O' Connell effect is present and a strong asymmetry after Min II can be explained assuming either a strong flare or circumstellar matter. [ABSTRACT FROM AUTHOR]

New precise times of minimum light for several early-type eclipsing binaries were obtained at three observatories. The changes of period of the following measured binaries are discussed: V1182 Aql, LY Aur, SZ Cam, FZ CMa, QZ Car, LZ Cen, V606 Cen, AH Cep and TU~Mus. [ABSTRACT FROM AUTHOR]

Seven new precise times of minimum light have been gathered for the triple eccentric eclipsing binary YY Sgr ( P = 2d.63, e = 0.16). Its O-- C diagram is presented and improved elements of the apsidal motion and the light-time effect are given. We found a new short period of the third body of about 18.5 years in an eccentric orbit ( e 3 ≃ 0.4). [ABSTRACT FROM AUTHOR]