  Mass segregation stands as one of the most robust features of the dynamical
evolution of self-gravitating star clusters. In this paper we formulate
parametrised models of mass segregated star clusters in virial equilibrium. To
this purpose we introduce mean inter-particle potentials for statistically
described unsegregated systems and suggest a single-parameter generalisation of
its form which gives a mass-segregated state. We describe an algorithm for
construction of appropriate star cluster models. Their stability over several
crossing-times is verified by following the evolution by means of direct N-body
integration.
