The Variable Lightcurves of RT Andromedae

All presently available photoelectric lightcurves of the short-period eclipsing binary RT Andromedae, belonging to a group of binaries with some properties similar to the RS CVn group, have been analysed in a homogeneous way using two different methods, viz. the Wood and the Wilson-Devinney methods. A unique solution has been found for all the 2pochs, thus eliminating the inconsistencies generated by the use of the rectification procedure (Mancuso et al., 1979 c). The presence of a 11migration wave" on the lightcurves, with a period of about 22-years, is ascertained by the analysis of the residuals with respect to the synthetic lightcurves and compared with the results obtained by means of the usual procedure. Although a complete analysis needs continuous observation of the system, yet some trends indicate that this group of the binaries has much more in common to the RS CVn one, than presently assumed.