[vsnet-chat 1684] Re: CW Mon---another CG CMa?

[aah@nofs.navy.mil]

Brian mentioned about two weeks ago that the coordinates for
CW Mon seemed to be discrepant between various sources, and
that might indicate another case of a close companion to a
CV.  While he has subsequently informed me that he has another
astrometric source, and that Joe Patterson has examined the
field and found no companion, I took a BV set before I learned
these details.  I found no companion near the CV, and its
magnitude/coordinates to be (using USNO-A2.0 as a reference):
    RA  (J2000)  DEC         V    B-V   verr  bverr
  06:36:54.59  00:02:17.4  16.47  0.23  0.04  0.03
Brian gave:
>  source        RA   (2000)   Dec
>DWS97       6 36 54.53  +00 02 16.3
>USNO-A2.0   6 36 54.55  +00 02 17.7
>AC2000      6 36 54.47  +00 02 17.4

So it looks to me like DWS97 just has a coordinate error of an
arcsec or so in Dec.  Do you know if they used GSC1.0 or GSC1.2
for their reductions?  I'm surprised AC2000 is off so far in RA.
It is too bad the SDSS calibration fields miss this region.

Arne

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