I wish I knew what was going on with these re-brightenings. I've been reading all I can. It's clear that there is evidence of spectral changes during these "maximums" in other novae. There seems to be very little available spectra of these sort of novae!
It looks as though we are at the peak brightness for the third "maximum" and that brightness is declining now. Does this correspond with the changes you observed in the Hb and Fe lines, Ken? I wonder ...
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