I want to start to obtain spectra of variable stars for AAVSO. Since a couple of months AAVSO have  opened a  spectrum database.  As kind of verification AAVSO asked as first spectrum a spectrum of a star which they call a ‘standard star’ . So i took 2 stars from the list mu UMa and eta Boo. Also a spectrum of ALTAIR for the instrument response.  Later i could also obtain 2 spectra of Be-stars: 28 Cyg and HD 194335.