  In this study, we determined the physical parameters of W UMa type contact
binaries and its stability of mass transfer with different stellar mass ranges
over a broad space by applying the basic dynamical evolution equations of the W
UMa type contact binaries using accretor and donor masses between 0.079 and
2.79 $M_{\odot}$. In these systems, we have studied the three sub-classes of
the W UMa system such as A-, B- and W-type of W UMa contact binaries using the
initial and final mass ranges and we investigated different stellar and orbital
parameters for the sub-classes of W UMa systems. We examined the stability of
the W UMa type contact binaries using the orbital parameters such as critical
mass ratio, Roche lobe radius of the donor star, and mass ratio of these
systems. Thus, we computed the observed and calculated physical parameters of
A-, B- and W-type of W UMa systems. Although, we determined the combined and
color temperatures to classify the three subclasses of the systems. Also, we
have presented the result of the internal stellar structure and evolution of W
UMa type contact binaries by using the polytropic model.
