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AG Draconis compared with Zeta Draconis: Spectra in Autumn 2018

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About this observation
Observer
John Coffin
Time of observation
28/10/2018 - 11:38
Object
AG Draconis
Observing location
Essex, UK
Equipment
Alpy 600
Atik 460 EX
Celestron 8 Edge HD with 0.7 x reducer
AZ-EQ6
Lodestar off axis guiding
Exposure
6 x 600s
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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.

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