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The first photoelectric light curve analysis of the TT And system in a broad band filter (400 - 700 nm) was carried out using the PHOEBE program. The absolute dimensions of the system are determined and its evolution is discussed. The most distinct feature of the system is a comparatively very low mass of the cooler component i.e. M2 = 0.26M⊙. Moreover, using the Observed-minus-Calculated data, the period changes of the system are studied, which reveal the presence of a third body orbiting the system with a period P3 = 63.89 yr, superimposed on which is a secular period increase, which is ascribed to mass transfer with a rate −7.60 × 10−12 M⊙ yr−1 from the cooler secondary component.

The Light Curve and the Orbital Period Variations of Binary System TT Andromedae