[vsnet-chat 4820] (fwd) WZ Sge comp stars (Henden)

[Taichi Kato <tkato>]

(fwd) WZ Sge comp stars (Henden)

   New informtion on the WZ Sge sequence from A. Henden:

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I've placed on
http://ftp.nofs.navy.mil/pub/outgoing/aah/sequence/wzsgea.dat
a single-night BV photometry file of a field to the west
of WZ Sge.  The wzsge.bright.dat file covers the region
from the variable to the east, in order to pick up the
Krzeminski and Kraft comparison stars.  However, the AAVSO
"e" chart has an 115 star to the west, and there has been some
private discussion as to the accuracy of that number.
  In particular, the AAVSO comp star appears in this new
single-night file as:
    V     B-V
  11.513  0.397
and so matches the AAVSO value quite well (it is also relatively
blue and so comes close to the color of WZ Sge).  The other western
AAVSO star that falls within this field of view is listed
at 99; my values give
   V     B-V
  9.846  0.544
which is very close.  Since I usually list single-night
photometry as having a potential 0.02mag zeropoint error,
whether you designate this star as 98 or 99 is your own
decision.

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