Betelgeuse
From the author of  
Sizing Up The Universe
Here's Betelgeuse (scroll down to see multiple spectra)...
Jan 9, 2018.
Starlight Express Trius-SX694 on 10" RCOS at f/9.
R = 0.6 sec, G = 0.6 sec, B = 0.6 sec in 0.04 second exposures.
Binned 1x1 and cropped. Nonlinear stretch.
Here's some spectra of betelgeuse...
 
Spectral data acquired using
Star Analyser 100.
 
 
Spectral plots shown here were made using
RSpec software.
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