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AG Draconis compared with Zeta Draconis: Spectra in Autumn 2018

Atik 460 EX
Celestron 8 Edge HD with 0.7 x reducer
AZ-EQ6
Lodestar off axis guiding
This is a spectrum of the symbiotic star AG Dra which is currently being monitored by ARAS (a French Group) at the request of some professional astronomers. It is shown here compared with the reference star Zeta Dra. There is a problem calibrating the wavelength. It is accurate at wavelengths shorter than H beta, but around 3 A out towards the longer wavelengths. There has been much discussion about this on the spectroscopy forum. It may turn out to be a limitation of the Alpy spectrometer.