ABSTRACT. Photoelectric timings of minima, obtained at KPNO, are reported for the short-period eclipsing variables V401 Cygni and Y Sextantis and a discussion of period variations is given based on all the material. V401 Cyg may be one of the few W UMa systems which exhibits a continuous, monotonie increase of the period. The period of Y Sex has been decreasing since the discovery of the variable, with the decrease occurring almost certainly in two abrupt changes.
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