(cba:news) V1674 Her, again

Joe Patterson jop at astro.columbia.edu
Fri Aug 6 08:37:50 EDT 2021

Hi CBAers,

A couple of extra remarks on the (reasonably) new nova.

1. Try for long runs.  As usual, we try to splice runs from distant 
longitudes to establish a consistent magnitude scale.  (The fact that 
it's not a *standard* magnitude scale is not important or relevant.) 
Lately, that magnitude scale is Tonny Vanmunster's, since his runs from 
Spain have been the most abundant.  So efforts to observe when Hercules 
is still reasonably available in the sky of western Europe would be 
nice.  Probably we'll also have a well-established scale in the USA 
before long, once the western observers jump in.

2. I notice from data submissions that these magnitude offsets are 
changing significantly.  That is very likely because people are changing 
comparison stars or filters, probably in response to the nova's rapid 
fading. Some indication of this in the submission (the data file, or the 
accompanying letter) would be helpful.  My guess is you'll probably want 
to stick to unfiltered from here on, unless the nova unexpectedly 
brightens (a lot).

3. The pattern of variability is still not clear, but is something I've 
never seen before in a nova.  And I've been looking a LONG time!

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