A PHOTOMETRIC ANALYSIS OF THE BINARY-SYSTEM KO AQUILAE

We report photometric uvbyoi observations of the variable KO Aql obtai ned during the summer of 1993. One time of primary minimum was observe d, and improved quadratic and linear ephemerides were calculated. Ecli pse timings of KO Aql, spanning over a sixty-year interval, show that the system is undergoing a period increase of 1.7 (+/-0.1)x10(-8) days /cycle. Analysis of our photometry with the new Wilson eclipsing-binar y computer program indicates that the mass ratio of the system is 0.29 and that the secondary star is cooler than the previously determined GO spectral type. The masses and radii of the two components are also estimated.