  This paper is the fourth one of a series whose chief objective is studying
the influence of different mass spectra on the dynamical evolution of open star
clusters. Results from several N-body calculations with primordial binaries and
mass loss due to stellar evolution are presented. The models show significant
differences with those for primordial binaries but no stellar mass loss
presented in de la Fuente Marcos (1996b). A differential dynamical behaviour
depending on cluster richness is found compared to de la Fuente Marcos (1996a).
The evolution of these realistic models is very dependent on the initial mass
function. Even for rich clusters, there is a dependence on the binary mass
spectrum. The velocity distribution of the escapers is examined and compared
with results from previous calculations. The evolution of the primordial binary
population is analyzed in detail. The cluster remnant and the final binary
population are also studied. Finally, some conclusions about observational
properties of Open Cluster Remnants are presented.
