[vsnet-alert 6951] Re: HT Cam super-ultra-bright outburst!

[aah@nofs.navy.mil]

Continuing discussion on this:  there are a nice series of
different scale finding charts on the AAVSO web page (dated 1/2001,
so preparation for the current outburst has been underway
for quite some time!); for example, a CCD F-scale chart is
  http://charts.aavso.org/ccd/CAM/HTCAM-F.GIF
Also, the Center for Backyard Astrophysics at
  http://cba.phys.columbia.edu/charts/
has a chart link to the Downes et al. 'Living Edition' chart at
  http://icarus.stsci.edu/~downes/cvcat/Images/cam_rxj0757.jpg
My B&V field photometry file lists all stars in the field down to ~19th mag:
  http://ftp.nofs.navy.mil/pub/outgoing/aah/sequence/htcam.dat
and Bruce Sumner's extraction of a visual sequence is at
  http://ftp.nofs.navy.mil/pub/outgoing/aah/sequence/sumner/htcam.seq

If you are doing visual photometry, it is probably best to use the
AAVSO charts since they have a standard sequence.  If you are doing
CCD photometry, any of the stars in Sumner's sequence, Skiff's sequence,
the AAVSO CCD chart (based on Sumner), or the .dat file should work
for comparison/check stars.
  In general, most of the interesting CVs have existing charts or standardization
that can be found in the vicinity of the links given above, which
should be your starting points.
Arne

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