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We perform a series of simulations of evolving star clusters using AMUSE (theAstrophysical Multipurpose Software Environment), a new community-basedmulti-physics simulation package, and compare our results to existing work.These simulations model a star cluster beginning with a King model distributionand a selection of power-law initial mass functions, and contain a tidalcut-off. They are evolved using collisional stellar dynamics and include massloss due to stellar evolution. After determining that the differences betweenAMUSE results and prior publications are understood, we explored the variationin cluster lifetimes due to the random realization noise introduced bytransforming a King model to specific initial conditions. This randomrealization noise can affect the lifetime of a simulated star cluster by up to30%. Two modes of star cluster dissolution were identified: a mass evolutioncurve that contains a run-away cluster dissolution with a sudden loss of mass,and a dissolution mode that does not contain this feature. We refer to thesedissolution modes as "dynamical" and "relaxation" dominated respectively. ForSalpeter-like initial mass functions, we determined the boundary between thesetwo modes in terms of the dynamical and relaxation time scales.

Simulating Star Clusters with the AMUSE Software Framework: I. Dependence of Cluster Lifetimes on Model Assumptions and Cluster Dissolution Modes