The role of initial binaries in cluster evolution - Direct N-body calculations

Details The role of initial binaries in cluster evolution - Direct N-body calculations The role of initial binaries in cluster evolution - Direct N-body calculations

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...143..321g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 143, no. 2, Feb. 1985, p. 321-326.

Statistics

Computation

16

Binary Stars, Computational Astrophysics, Gravitational Collapse, Many Body Problem, Star Clusters, Stellar Evolution, Collision Rates, Computerized Simulation, Energy Distribution, Mass Distribution, Star Distribution, Stellar Motions

Scientific paper

The presence of initial binary systems in stellar clusters seems to have a dominant effect on the dynamical evolution of the whole cluster. Simulations carried out with a direct N-body method are discussed for several models with N = 300 equal-mass objects, with 20 percent of initial binaries and different binary binding energy. These calculations show that the binaries with values of binding energy (h) in the range 5-10 times the mean kinetic energy interact strongly with the field stars and among themselves. The main result of these interactions is an enhanced expansion of the core and of the whole cluster. The binary heating prevents the gravitational collapse for a time longer than the usual collapse time for systems without binaries. Energetic binaries with h greater than 25 concentrate at the center, but their binary-binary interactions produce disruption and escape of the components, with fewer consequences for cluster evolution. Binary/binary interactions occur in central regions, while single-star-binary interactions mainly occur in outer regions. The former produce core heating and are mostly responsible for the escaping stars, while the latter contribute to a strong expansion of the halo. In all the simulations there was no formation of new persistent hard binaries.

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