Nova Cas 2021 Alpy spectrum

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Hugh Allen
At last a slightly murky break in the clouds here in The Mendips, to allow me to record the evolving spectrum of this beautiful nova. There are many neutral helium emission lines as well as the hydrogen Balmer series, all with very striking P Cygni profiles due to Doppler shift in the expansion along our line of sight. It is always a thrill to capture the spectrum of a unique object like this