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28 April 2021 at 9:34 pm #584140
A recent Astronomer’s telegram, ATel 14577, details changes in the spectrum with the emergence of iron lines. Lots of spectra on the ARAS web site show these lines developing with He I lines fading.
The He I lines labelled in my low res spectrum from 23rd April may actually be Fe II instead… More spectra planned when the skies clear again…