I have been capturing Beta Lyrae spectra on my DIY spectrometer (1200 l/mm grating) to monitor what happens as this binary pair eclipse each other. The UK weather hasn't allowed me to capture data on as many nights as I wanted, but something is better than nothing.
The lines are split due to rotation of the accretion disc (doppler effect). The helium seems to show this far more than Hydrogen. I will try and figure out how to calculate the rotation speed.
The DIY spectrometer used is actually still work in progress so the spectra quality will improve as I iron out a few issues.
Thanks for looking