Examples of past variation

Forums Spectroscopy Request for monitoring of X Per Examples of past variation

Robin Leadbeater

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


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