Abstract
We present a period analysis of the four well- known W UMa-type eclipsing binaries DK Cyg (P = 0: 47), V401 Cyg (0: d 58), AD Phe (0: 38) and Y Sex (0: d 42). Several new times of minimum light, recorded photo- electrically, have been gathered. Analysis of all available eclipse timings of the DK Cygni and V401 Cygni has con- rmed a signicant increase in period of 1:15 10 10 and 1:48 10 10 day cycle 1 , respectively. A simultaneous so- lution of the B;V and R light curves was computed for V401 Cyg using the Binary Maker 2.0 synthetic lightcurve software. This solution indicates that V401 Cyg is in con- tact with a ling factor of 46%. The period of AD Phe seems to be constant. Period changes of Y Sex could be explain by a light-time eect caused by a third body in an eccentric orbit with a period of 58 years.
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