Parker, R.J., Goodwin, S.P., Kroupa, P. et al. (1 more author) (2009) Do binaries in clusters form in the same way as in the field? Monthly Notices of the Royal Astronomical Society, 397 (3). pp. 1577-1586. ISSN 0035-8711
Abstract
We examine the dynamical destruction of binary systems in star clusters of different densities. We find that at high densities (104– 105 M⊙ pc−3) almost all binaries with separations >103 au are destroyed after a few crossing times. At low densities [forumla], many binaries with separations >103 au are destroyed, and no binaries with separations >104 au survive after a few crossing times. Therefore, the binary separations in clusters can be used as a tracer of the dynamical age and past density of a cluster. We argue that the central region of the Orion nebula cluster was ∼100 times denser in the past with a half-mass radius of only 0.1–0.2 pc as (i) it is expanding, (ii) it has very few binaries with separations >103 au and (iii) it is well mixed and therefore dynamically old. We also examine the origin of the field binary population. Binaries with separations <102 au are not significantly modified in any cluster, therefore at these separations the field reflects the sum of all star formation. Binaries with separations in the range 102– 104 au are progressively more and more heavily affected by dynamical disruption in increasingly dense clusters. If most star formation is clustered, these binaries must be overproduced relative to the field. Finally, no binary with a separation >104 au can survive in any cluster and so must be produced by isolated star formation, but only if all isolated star formation produces extremely wide binaries.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2009 The Authors. Journal compilation © 2009 RAS. This is an author produced version of a paper subsequently published in Monthly Notices of the Royal Astronomical Society. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | methods: N-body simulations; binaries: general; stars: formation; open clusters and associations: general |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 17 Aug 2017 13:36 |
Last Modified: | 20 Mar 2018 17:47 |
Published Version: | https://doi.org/10.1111/j.1365-2966.2009.15032.x |
Status: | Published |
Publisher: | Oxford University Press |
Refereed: | Yes |
Identification Number: | 10.1111/j.1365-2966.2009.15032.x |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:120265 |