OBSERVATIONS AND PERIOD STUDIES OF 2 NEGLECTED W-UMA SYSTEMS - V401 CYGNI AND Y-SEXTANTIS

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, monotonic 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.