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Oxford University Press (OUP), Monthly Notices of the Royal Astronomical Society, 1(374), p. 344-356

DOI: 10.1111/j.1365-2966.2006.11166.x

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Star clusters with primordial binaries - II. Dynamical evolution of models in a tidal field

Journal article published in 2007 by Douglas C. Heggie, Michele Trenti ORCID, Piet Hut
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Data provided by SHERPA/RoMEO

Abstract

We extend our analysis of the dynamical evolution of simple star cluster models, in order to provide comparison standards that will aid in interpreting the results of more complex realistic simulations. We augment our previous primordial-binary simulations by introducing a tidal field, and starting with King models of different central concentrations. We present the results of N-body calculations of the evolution of equal-mass models, starting with primordial binary fractions of 0- 100 %, and N values from 512 to 16384. We also attempt to extrapolate some of our results to the larger number of particles that are necessary to model globular clusters. We characterize the steady-state ‘deuterium main sequence ’ phase in which primordial binaries are depleted in the core in the process of ‘gravitationally burning’. In this phase we find that the ratio of the core to half-mass radius, rc/rh, is similar to that measured for isolated systems (Heggie et al. 2005). In addition to the generation of energy due to hardening and depletion of the primordial binary population, the overall evolution of the star clusters is driven by a competing process: the tidal