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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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