Examples of past variation

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#580277
Robin Leadbeater
Participant

This paper shows examples of the long term variation (1987-2001) at H alpha and He 6678   including an episode where the disc was completely lost in 1988 and cyclic changes with periods 0.6-2 yrs

https://www.aanda.org/articles/aa/abs/2001/47/aa1796/aa1796.html

The variability that Kevin highlighted (and confirmed in the other spectra) shows small scale variations in the line profiles at much shorter timescales though

Robin