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On the Stability of Small Clusters or Cluster Remnants

Published online by Cambridge University Press:  14 August 2015

L. O. Lodén  and
H. Rickman
L. O. Lodén
Affiliation:
Astronomical Observatory, Uppsala, Sweden
H. Rickman
Affiliation:
Stockholm Observatory, Saltsjöbaden, Sweden

Abstract

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There is strong evidence that the occurrence of mutually very nearby stars with identical spectral type and apparent magnitude is in many cases appreciably more frequent than one has reason to expect if there should only be a case of pure random combination. This phenomenon might be associated with the problem of stability of small stellar systems, if we can identify a certain number of the coincidences as some sort of cluster remnants. Besides the fact that there are several physical explanations of the coincidence phenomenon without consideration to dynamical stability conditions, there is also more than one stability aspect which may be regarded as reasonable. In the first instance we have to survey the possibilities that the stability of certain conglomerations of stars - particularly those with two components - may depend on the mass relation and will reach a maximum value for equal masses. As most straightforward we regard the conception that the most massive stars in a cluster (or even a multiple system) form the most stable and hence the most long-lived configuration, so that a cluster remnant most probably will consist of stars of rather equal mass.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 62: The Stability of the Solar System , 1974 , pp. 231 - 238
Copyright
Copyright © Reidel 1974 

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