[vsnet-chat 3594] V446 Her companion photometry

[aah@nofs.navy.mil]

Here are results from psf-fitting the triplet of
companion stars to V446 Her.  The stars are labelled
A,B,C, where A and B are identified on the finding chart
in Honeycutt, et al. 1998, ApJ 495, 933, and star C
is the faint companion due west of the variable.
The RA,DEC offsets are in arcsec, positive east and north.

Star   RA    DEC     V    err   B-V   err   V-R   err   R-I   err
  A   1.49  -2.75  17.90  0.02  1.33  0.04  0.78  0.03  0.67  0.02
  B  -2.18  -2.53  18.51  0.02  1.28  0.08  0.74  0.01  0.75  0.01
  C  -2.62  -0.39  20.87  0.25  1.10  0.52  1.08  0.24  0.75  0.25
  
These numbers are more reliable than the values in the Honeycutt
paper since the current images had better seeing and higher
signal/noise.
  V446 Her itself is at
    18:57:21.61  +13:14:29.7  J2000
again improved over the Honeycutt paper through the use of USNO-A2.0.
Since the variable is about V=16.5 and B-V = 0.27, you must be careful
to remove these three stars when doing photometry or you will report the
variable as being too bright; this is especially true at the
red wavelengths or with unfiltered photometry.

Arne

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