A comprehensive Nbody study of mass segregation in star clusters: Energy equipartition and escape

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dc.creatorKhalisi, Emil
dc.creatorAmaro-Seoane, Pau
dc.creatorSpurzem, Rainer
dc.date2006-02-27
dc.date2006-10-16
dc.date.accessioned2026-07-07T10:27:52Z
dc.date.available2026-07-07T10:27:52Z
dc.descriptionWe address the dynamical evolution of an isolated self--gravitating system with two stellar mass groups. We vary the individual ratio of the heavy to light bodies, $μ$ from 1.25 to 50 and alter also the fraction of the total heavy mass $\MH$ from 5% to 40% of the whole cluster mass. Clean-cut properties of the cluster dynamics are examined, like core collapse, the evolution of the central potential, as well as escapers. We present in this work collisional $N$-body simulations, using the high--order integrator NBODY6++ with up to ${\cal N}_{\star}=2\cdot 10^4$ particles improving the statistical significancy of the lower--${\cal N}_{\star}$ simulations by ensemble averages. Equipartition slows down the gravothermal contraction of the core slightly. Beyond a critical value of $μ\approx 2$, no equipartition can be achieved between the different masses; the heavy component decouples and collapses. For the first time the critical boundary between Spitzer--stable and --unstable systems is demonstrated in direct $N$-body models.
dc.description21 pages, minor changes, accepted for publication MNRAS, needs mn2e.bst and mn2e.cls (included)
dc.identifierhttps://arxiv.org/abs/astro-ph/0602570
dc.identifierhttp://arxiv.org/abs/astro-ph/0602570
dc.identifierMon.Not.Roy.Astron.Soc.374:703-720,2007
dc.identifierdoi:10.1111/j.1365-2966.2006.11184.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/177282
dc.subjectAstrophysics
dc.titleA comprehensive Nbody study of mass segregation in star clusters: Energy equipartition and escape
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