The core collapse of globular clusters with stellar evolution

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Fokker-Planck Equation, Globular Clusters, Gravitational Collapse, Stellar Evolution, Density Distribution, Stellar Mass

Scientific paper

The orbit averaged Fokker-Planck equation is used to study the dynamical evolution of globular clusters. Stellar evolutions according to their masses are incorporated in the model. The initial density distribution is chosen by Plummer's model with the initial mass function index alpha = 0.65, 1.35, 2.35, and 3.35. The mass-loss rate is given by the model of Fusi-Pecci and Renzini (1976). It is found that the stellar mass loss acts as an energy source, and thereby affects the dynamical evolution of globular clusters by slowing down the evolution rate and extending the core collapse time. Also, the dynamical length scale is extended.

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