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primary topic: Equipartition and mass segregation : simulations of star clusters with two mass-components

Equipartition and mass segregation : simulations of star clusters with two mass-components
type: Article
abstract: The dynamical evolution of an isolated self-gravitating system is studied under the aspects of mass segregation and equipartition processes. We analyse the idealized case of a cluster with two distinct mass components. The individual ratio of the heavy to light bodies, \mu = m_2/m_1, is varied from 1.25 to 50.0 and the fraction of the total heavy mass is altered from 5% to 40% of the whole cluster. We also examine the cluster properties like the core collapse, the evolution of the central potential, the radial stratification of masses as well as escapers. We present new, high-accuracy collisional N-body simulations, using the high-order integrator NBODY6++. We modelled up to N=20,000 particles on the parallel supercomputer CRAY T3E, and the statistical significancy of the lower-N simulations was improved by ensemble averages. Our objective is to check the various theories on early star formation and dynamical evolution. We find significant deviations of the evolutionary time scale in the regime \mu -> 1. Equipartition slows down the gravothermal contraction of the core slightly. Beyond a critical value of \mu ~ 2, no equipartition can be achieved between the different masses, a phenomenon known as the Spitzer equipartition instability; the heavy component decouples and collapses under the influence of the gravothermal instability of its own subsystem. For the first time the critical boundary between Spitzer-stable and -unstable systems is demonstrated in direct N-body models.
date: 2002
status: published
author list: authors
type: EPrint
type: DoctoralThesisEPrint
is part of: repository
has document: Equipartition and mass segregation : simulations of star clusters with two mass-components (PDF)
has document: Equipartition and mass segregation : simulations of star clusters with two mass-components (Other)
subject: 530 Physik

Equipartition and mass segregation : simulations of star clusters with two mass-components (PDF)
type: Document
has file: thesis2.pdf
has part: thesis2.pdf

Emil Khalisi
type: Person
given name: Emil
family name: Khalisi

Equipartition and mass segregation : simulations of star clusters with two mass-components (Other)
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Equipartition and mass segregation : simulations of star clusters with two mass-components (Other)
type: Document
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Equipartition and mass segregation : simulations of star clusters with two mass-components (Other)
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Equipartition and mass segregation : simulations of star clusters with two mass-components (Other)
type: Document
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Equipartition and mass segregation : simulations of star clusters with two mass-components (Other)
type: Document
is version of: Equipartition and mass segregation : simulations of star clusters with two mass-components (PDF)
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primary topic: Equipartition and mass segregation : simulations of star clusters with two mass-components

530 Physik
type: Concept
preferred label: 530 Physics @en