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The Formation of Multiple Systems by Dynamical Interaction in Clusters

Published online by Cambridge University Press:  12 April 2016

S. J. Aarseth
S. J. Aarseth*
Affiliation:
Institute of Astronomy University of Cambridge

Abstract

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This review is mainly devoted to a discussion of binary formation and evolution in stellar systems, as described by N-body techniques. The simplest formation mechanisms consist of ejection from bound triple systems and capture arising from hyperbolic three-body encounters. However, the large number of astrophysically close binaries cannot be accounted for in this way unless most stars are formed in compact groups. Numerical calculations show that the evolution of clusters containing several hundred members is invariably dominated by one central binary which absorbs a large fraction of the total energy. It is suggested that a visual binary in the core of the Hyades cluster may have been associated with this process.

Resumen

Resumen

Esta reseña se dedica, especialmente a la discusión de la formación y evolución de binarias en sistemas estelares obtenida con técnicas de N cuerpos. Los mecanismos más sencillos de formación consisten en la eyección de sistemas triples ligados y la captura resultante de encuentros hiperbólicos triples. Sin embargo, no se puede explicar de esta manera el gran número de binarias astrofísicamente cercanas a menos que las estrellas se formen en grupos compactos. Cálculos numéricos muestran que la evolución de cúmulos, con varios centenares de estrellas, es dominada invariablemente por una binaria, central que absorbe una fracción substancial de la energía total. Se sugiere que una binaria visual en el centro del cúmulo de las Yadas puede estar relacionada a este proceso.

Type
Session 6
Information
International Astronomical Union Colloquium , Volume 33: Observational Parameters and Dynamical Evolution of Multiple Stars , May 1977 , pp. 199 - 206
Copyright
Copyright © Otto G. Franz and Paris Pismis 1977

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