I find comparing the spectra I am producing with professional spectra of the same stars a good way of checking that my acquisition and data reduction techniques are sound. With the ALPY, MILES stars are useful for this. For example at this time of year one could use stars in Taurus eg
HD 27819 (64 Tau) A7v mag 4.8 at 48deg altitude from here at midnight currently could be used as the reference star and nearby MILES stars of various spectral types could be measured and compared with the spectrum in the library eg
HD28305 (Eps Tau) G9.5iii mag 3.5 49 deg
HD27962 (68 Tau) A2iv mag 4.2 48 deg
HD29139 (Aldebaran) K5iii mag 0.8 46 deg
Hopefully the measured and library spectra will be a perfect match !
I measured these stars (and added a few more to better cover the spectral classes) on Saturday.
See the attached report.
I have also attached the reduced spectra as fits files if anyone wants to play with them. (Note the extension has been changed from fit to fits to be acceptable for upload to the forum. I also tried zipping them together but the forum does not allow zip files unfortunately)
The results are generally very encouraging with typically less than 2% error in relative flux from 4000-7300A. There are some larger systematic errors below 4000A which seem to be due to a small flux offset and will need further investigation. Extra precautions also need to be taken against scintillation when measuring first magnitude targets.