A self-consistent, physically accurate program suite has been used in
an accurate simulation of new spectroscopy and photometry of MR Cygni.
Analysis of both the spectroscopic and photometric data used spectrum
synthesis techniques and a synthetic photometry augmentation of a lig
ht synthesis program package. The theoretical light curves closely fit
the observational data. The same self-consistent parameters from the
light synthesis solution produced synthetic spectra precisely fitting
the observed spectra at all orbital phases. The IRAF-reduced spectrosc
opy has produced an accurate double-lined radial velocity curve. The d
erived mass ratio differs greatly from photometric mass ratios in the
literature. New UBV photometry closely replicates existing data and in
dicates photometric stability of the binary system. A synthetic spectr
um fitted to IUE data established the primary component T-eff. The lig
ht curve solution determined a single set of system parameters used to
calculate U, B, and V light curves. We conclude that MR Cygni is a me
mber of the relatively rare class of hot Algol systems defined by Popp
er. It is likely that mass transfer still is in progress, but there is
no evidence, either from orbital period variation or from a bright sp
ot on the mass gainer, for its existence. The lack of H alpha emission
in any of our spectra, including one at phase 0.063, suggests a small
current rate of mass transfer. The fact that our computationally self
-consistent procedure has successfully represented both the photometry
and the spectroscopy for a binary system whose components are appreci
ably distorted demonstrates the overall power of the procedure.