RV (Radial Velocity)
Stars are moving into space and their spectra appear shifted compared to the same lines in laboratory. Exemple here is SAO104807 which is moving toward us at a speed of 100 km/Sec and SAP112958 which is moving away at the speed of 99 km/sec. With the Lhires III high resolution, you even have to correct from the Earth movement to do a proper calculation!
Shift in the spectra of those two stars taken with a Celestron 11 and a Lhires III is easily visible compared to Alair spectra. This is an easy and highly educational project !
Comparison spectra SAO104807, Altair, and SAO 112958
The same spectra in graphic form