Here's a graph of the Be star V 2136 Cyg from 04/2014 to 08/2016.
The graph shows that H Alpha emission line decreases over time.
V2136 Cyg evolution
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V2136 Cyg evolution
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html