H alpha evolution and He 6680 line › Forums › Spectroscopy › Request for monitoring of X Per › H alpha evolution and He 6680 line 29 September 2018 at 2:53 pm #580034 Robin LeadbeaterParticipant Changes in H alpha over past 6 days The He I 6680 line (approximately 15x weaker than H alpha) Radial Velocity of both lines (km/s, plotted in system rest frame) Cheers Robin
