Journal Article

On the formation of trapezium-like systems

Richard J. Allison and Simon P. Goodwin

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 415, issue 2, pages 1967-1976
Published in print August 2011 | ISSN: 0035-8711
Published online July 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18849.x
On the formation of trapezium-like systems

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We investigate the formation and evolution of high-order massive star multiples similar to the trapezium in the Orion Nebula Cluster. We perform ensembles of N-body simulations of the evolution of N= 1000 Orion-like clusters with initial conditions ranging from cool and clumpy to relatively smooth and relaxed. We find that trapezium-like systems are frequently formed in the first 2 Myr in initially cool and clumpy clusters and can survive for significant amounts of time in such clusters. We also find that these systems are highly dynamical entities, constantly interacting with the surrounding cluster, changing their appearance and membership regularly. The eventual decay of trapezium-like systems can even destroy the host cluster. We argue that the current state of any trapezium-like system is transient and care should be taken when analysing and drawing conclusions from a single snapshot in the life of a highly dynamic object.

Keywords: stars: formation; stars: kinematics and dynamics; stars: massive; galaxies: star clusters: general

Journal Article.  7549 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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