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2 Smak J.

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TT Ari and its Quasi-Periodic Oscillations

Smak J.

Acta Astronomica

2014

Vol. 64, No. 2

167--175

Quasi-periodic oscillation (QPO) of TT Ari are transient, short-lived phenomena. They appear and disappear and their periods and amplitudes vary on a time scale as short as 1 hour. Consequently the periodograms covering longer intervals of time are generally meaningless.

Fifty Years of TT Arietis

Smak J.

Acta Astronomica

2013

Vol. 63, No. 4

453--463

Results of photometric observations of the permanent negative superhumper TT Ari in 1961/62 and 1966 are presented. Together with data from the literature they are used to discuss the negative superhump amplitudes AnSH and the amplitudes Abeat of the modulation with the beat period Pbeat. Both amplitudes are shown to vary considerably from one season to another. Three correlations are found: (1) between AnSH and Abeat, (2) between AnSH and PnSH, and (3) between Abeat and Pbeat.