A gas model for multicomponent star clusters - Method and comparison with Fokker-Planck theory

Astronomy and Astrophysics – Astronomy

Scientific paper

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Fokker-Planck Equation, Gas Dynamics, Star Clusters, Stellar Gravitation, Stellar Models, Stellar Systems, Boltzmann Distribution, Differential Equations, Kinetic Energy, Maxwell Equation, Stellar Mass

Scientific paper

A multi-mass stellar system is simulated by integrating numerically a set of four gas-model equations for each component. The components interact by mutual gravitational interaction, by transfer of kinetic energy and by dynamical friction effects. Pre-collapse calculations of two-component systems are presented and compared with the results obtained by direct integration of the fundamental Fokker-Planck equation. The gas model shows a higher degree of equipartition of the kinetic energies. Later-phase evolution is somewhat slower as compared with results of the Fokker-Planck theory. The qualitative behaviour of evolution is, however, in fair agreement.

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