The two periods of TT ARIETIS

Details The two periods of TT ARIETIS The two periods of TT ARIETIS

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97..437t&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 97, May 1985, p. 437-445.

Astronomy and Astrophysics

Astronomy

49

Cataclysmic Variables, Eclipsing Binary Stars, Stellar Spectra, Ephemerides, Phase Shift, Radial Velocity

Scientific paper

To clarify the spectroscopic period and demonstrate that the spectroscopic and photometric periods are distinct, velocities of the cataclysmic variable TT Ari in its high and intermediate photometric states are obtained. Evidence for periodicity is found near the period of Cowley et al. (1975) in both the high-state and intermediate-state velocities and in a reanalysis of the Cowley et al. velocities no evidence is found for periodicity near the photometric period. Since no single period fits all the data well and since the original Cowley et al. period fits all the high-state data quite well, it is shown that the velocities change phase between the high and the intermediate states. Results indicate that the intermediate-state velocities lag the high-state velocities by 0.28 of a cycle and that in the high-state data, the gamma velocities tend to be systematically lower for the high-order Balmer lines.

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