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Abstract
Spectroscopic observations in the range 6500{6700 A and BVRI photometry of the eclipsing short- period RS CVn-star RT And are presented. We determined K1 = 130 km s 1 and K2 = 175: 8k m s 1 by measurement of the double proles of the lines H and FeI 6678, and obtained the mass ratio q =0 :74 and masses of the star components M1 =1 :23 M and M2 =0 :91 M. It was established that the emission activity of RT And is associated with its secondary component. The relative contribution of the secondary star is stronger in the FeI 6678 line than in H. A strong emission feature between the two proles of FeI 6678 at phase 0.73 was detected that is probably due to the appearance of extended emitting structure. The multicolor light curve of RT And is tted by two cool spots on the primary star with equal sizes 21 and temperatures 4980 K and located at middle latitudes and longitudes symmetrical to the line connecting the star centers. Both spectral and photometric data lead to the conclusion that the secondary star of RT And is oversized for its mass.
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