[sheeny (Al)]

Originally Posted by Merlin66

Robin posted a note in the forum to remind us of the H20 lines at 6900, 7200, and 7600.
These are shown well in Buil's Vega spectra:
http://www.astrosurf.com/buil/us/vatlas/vatlas.htm

Looks like you've picked them up in the Betelgeuse spectra!

Yeah, the 7600 band is very obvious... I wondered what that was.

I haven't corrected for H2O - with my standard setup I usually capture say 3000 to 7000 Å. I'll have a further play with the data to see if I can get a better spectrum. These were quickies stacked in registax, and I found some alignment issues, so I may be able to do better either by selecting the best single frame or spending some time manually ensuring the alignment points are right before stacking.

Al.