Halpha monitoring of zeta Tau

[Ernst Pollmann]

Zeta Tau is further on the way to its disk loss.
The Halpha EW reached its historical minimum together with an further increasing of the central absorption core (see attachment).

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