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Fast photoelectric photometry of the nova-like variable TT Ari
Rapid photoelectric photometry (sampling time 3s) of the nova-likecataclysmic variable TT Ari has been carried out on three nights(November 22, 23, 24, 1978). Quasi-periodic fluctuations (time scalegreater than or equal to 6 min) and substantial rapid flickering (up to0.02 Hz) are superimposed on an almost sinusoidal light-curve. Duringtwo nights oscillatory events, with periods of approximately 40s, andlasting for about 1500s, have been detected. Inhomogeneities orinstabilities in the accretion disk may be responsible for theproperties of these short periodic oscillations.
| TT Ari
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| Lunar occultation summary. III
Observations of 242 photoelectric lunar occultation events studied atErwin W. Fick Observatory are reported. Approximately one-fourth ofthese are reappearances. From each observation are estimated the minimummagnitude differences between the observed object and possibleundetected companions. Occultation observations are given of 23 starsbrighter than 6th mag, including Alpha Vir, Beta-1 Sco, Mu Gem, Xi-2Sgr, Zeta Tau, Lambda Gem, and Beta Cap.
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