  Modelling of the point spread function of the UKIRT IRCAM3 array was
conducted in order to test any extended emission around the X-ray binary Cyg
X-3. We found that the point spread function cannot be represented by a simple
Gaussian, but modelling of the stars required additional functions namely
Lorrentzian and exponential components. After modelling for the PSF, we found
that Cyg X-3 could be represented by two stellar-type profiles, 0.56" apart.
