Hi all,
a forum member recently asked about doing some simple spectroscopy. I have been using this piece of gear:
http://www.patonhawksley.co.uk/staranalyser.html
together with this piece of software:
http://www.astrosurf.com/vdesnoux/index.html
The image of Betelgeuse below was taken with a Canon 350D, 135mm f4 lens + 2x teleconverter, 6 secs exposure with a star analyser. Processing the spectra shows molecular bands, TiO, and other various other ionised metals, which is a function of the temp ~3500 Kelvin. A different slant on why stars are the colours they are...
cheers
Mark