Francois Teyssier’s “Low Resolution Spectroscopy Observer’s Guide” is an excellent source of ideas for the kind of observations which can be made by amateurs using low resolution spectrographs such as the ALPY600. It can be downloaded (In the original French or in English and Italian translation), from his website here
http://www.astronomie-amateur.fr/
Cheers
Robin
http://www.threehillsobservatory.co.uk