Abstract:
The long-term variations of the radial velocities (RV) of the shell absorption lines and the violet-to-red ratio (V/R) of the emission double peaks of ζ Tau are examined, based on spectrograms taken at the Okayama, Astrophysical Observatory. It is found that the pscudo-periodic variation was terminated around 1982 and that ζ Tau seems to have entered a new quiet phase in its long-term activity.
