  Measurements of a variety of hadron species in Au+Au collisions at 200 GeV by
the STAR experiment are used to investigate properties of such collisions. We
present a study of particle yields and transverse momentum spectra within the
framework of chemical and local kinetic equilibrium models. The extracted
freeze-out properties are studied as function of collision centrality. Those
properties together with inferred initial conditions provide insights about
collision dynamics at RHIC.
