  We have applied the graphical user interfaced close binary system analysis
program WinFitter to an intensive study of Kepler 91 using all the available
photometry from the NASA Exoplanet Archive (NEA) at the Caltech website:
http://exoplanetarchive.ipac.caltech.edu . Our fitting function for the tidal
distortion derives from the relevant Radau equation and includes terms up to
the fifth power of the fractional radius. This results in a systematic
improvement in the mass ratio estimation over that of Lillo Box et al (2014a)
and our derived value for the mass ratio is in close agreement with that
inferred from recent high-resolution spectroscopic data. It is clear that the
data analysis in terms of simply an eclipsing binary system is compromised by
the presence of significant other causes of light variation, in particular
non-radial pulsations. We apply a low-frequency filtering procedure to separate
out some of this additional light variation. Whilst the derived eccentricity
appears then reduced, an eccentric effect remains in the light curve. We
consider how this may be maintained in spite of likely frictional effects
operating over a long time. There are also indications of the possible effects
of Trojan or other period-resonant mass concentrations. Suggestions of a
possible secular period variation are briefly discussed.
