Abstract
Simultaneous photoelectric and polarimetric BVR measurements of RY Tau were made from December, 1987 to March, 1993, after the star's extraordinary brightness increase on October, 1983. The presence of a correlation between polarization and photometric variability was found near the new light maximum of the star. But when the star becomes fainter than some brightness level, the correlation disappears and peculiarities of the P parameter behaviour resemble those before the RY Tau “flash”. The position angle varied from 0° to 40° without any correlations with photometric variability or with polarization value. The interpretation of the observed phenomena was made by comparison with a “flash” of another T Tauri star, DR Tau “flash”. We assumed the presence of two young stars in the direction of RY Tau. One of them is the well-known object. It is a probable close binary system. Another one is the YY Ori type companion which flashed.