Tidal Limit of Stellar Systems in Two-Power Density Models
  As the generalization of gravitational effects on the point mass systems, we
want to study the tidal effect exerted on an extended stellar system using
spherical and axisymmetric elliptical models. Considering the Isochrone and
Plummer models for a passing extended stellar system, the tidal distance and
the equipotential surface are calculated. The corresponding critical surfaces
and maps are plotted in different cases. There are different results some of
them may be used in describing stellar systems deformation
