Abstract
The RS CVn-type eclipsing binary AR Lac has been observed in two colours,B andV, in 1978 and 1979. Several times of minima have been obtained during the observations and the new light elements have been calculated. The orbital period of the system was found to be decreasing with an amount of 14.6 s century−1. The light curves of the system obtained inB andV show a significant wave-like distortion outside eclipses. The amplitudes of the wave-like distortion inB andV are about 0 . 09 and 0 . 10 in 1978, and, 0 . 12 and 0 . 13 in 1979, respectively. The minima of the wave-like distortion have shifted with an amount of 0 . 40 in one year, thus indicating the migration period of the wave-like distortion is about 2.5 yr. A noticeable variation of light during the totality of primary minimum has also been observed. This variation can be attributed to the distortion wave which has been moving towards decreasing phases.
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