TT ARIETIS - PHOTOMETRIC VARIABILITY FROM 1985 TO 1994

Results of photoelectric observations of TT Ari during the 1985-1994 i nterval are presented. Observations were carried out at the Rozhen and Belogradchik observatories as part of our programme for the study of anti-dwarf novae. The long-term light curve in the standard UBV system is constructed and peculiarities of the long-term behaviour of the st ar in this time interval are discussed. 21 moments of maxima and 14 mo ments of minima are added to the list of known maxima and minima of 3. 2-hour modulations. The period of 3.2-hour modulations during the 1987 /1988, 1989/1990 and 1990/1991 seasons is determined. In our 29 observ ing runs we searched for 20-min quasi-periodic variations, which were detected in 25 of them. Our results show that in 1989, the 20-min modu lation mean period reached a local maximum of 19.45 min and declined a fterwards. The mean brightness variability analysis during the aforeme ntioned seasons confirmed the reliability of the 3(.)(d)8 period suspe cted by Semeniuk et al. (1987).