[vsnet-alert 4043] Re: TmzV85 identification

[aah@nofs.navy.mil]

What Rudolf says is correct -- with most aperture photometry,
you will include both objects in your aperture.  However, the
NE component is about 19th and the SW component about 17th
in quiescence.  If the CV is the SW component, and is now
about 14th mag, then the NE component will be negligible
and will not affect your photometry.  However, if the reverse
is true, then you will have a few percent zero-point error
in your numbers, and possibly false variation if the aperture is
in the 6-10 arcsec diameter range.
  I can do psf-fitting and get quiescent magnitudes for both
components, but that does not uniquely determine which star
is the CV.  Astrometry will be the deciding factor.  Even
there, beware of the companion, whichever star it is!
Arne

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