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For the purpose of a descriptive understanding of the movement of the disk gas around the central star and for the disk precession of ζ Tau, I prepared two ppt-presentations on the base of the paper of G. H. Schaefer et al. (ApJ, 140, 1838-1849) and M. Winkhaus (thesis/diploma, Astronom. Institut, University of Bochum, 1997).

In ppt-presentation 2, τ = V/R phase for the 1429 d period.

τ = 0.00 = V>R (max.)
τ = 0.25 = V=R
τ = 0.50 = V<R (min.)
τ = 0.75 = V=R

Both presentations will help, to imagine better the dynamic behavior of the Be star gas disk.

ppt-presentation 1:
Orbital movement of the disk gas atoms in ζ Tauri
http://astrospectroscopy.de/ppt1.ppt

ppt-presentation 2:
Disk precession variations in ζ Tauri
http://astrospectroscopy.de/ppt2.ppt


Ernst Pollmann
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Active Spectroscopy in Astronomy
http://www.astrospectroscopy.de
http://www.astronomie.de/astronomische- ... troskopie/