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A new photoelectric investigation of the W UMa system U Pegasi
Data from 217 pairs of BV photometric observations of U Peg, obtainedwith a single-channel photomultiplier photometer on the 60-cm reflectorat Beijing Observatory during 1978, are presented in tables and graphsand discussed in comparison with previous observations. Four minimatimes are determined; a secular period decrease of 4.16 msec/yr iscalculated from for the period 1896-1978; and a 17-yr oscillation withsemiamplitude 0.00323 d is identified and attributed to the light-timeeffect of a main-sequence type-M6 third body of 0.16 solar mass.Interpretation of the 1978 light curves and those obtained by Binnendijk(1960) in 1958 indicates an overcontact of about 9 percent, aphotometric mass ratio m2/m1 between 2.5 and 3, a gamma velocity of -40km/sec, and dimensions 0.6 solar mass and 0.8 solar radius for the firstcomponent and 1.3 solar mass and 1.4 solar radius for the secondcomponent.
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