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A clustered origin for isolated massive stars

Lucas, WE, Rybak, M, Bonnell, IA and Gieles, Mark (2017) A clustered origin for isolated massive stars Monthly Notices of the Royal Astronomical Society, 474 (3). pp. 3582-3592.

1711.09927.pdf - Accepted version Manuscript

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High-mass stars are commonly found in stellar clusters promoting the idea that their formation occurs due to the physical processes linked with a young stellar cluster. It has recently been reported that isolated high-mass stars are present in the Large Magellanic Cloud. Due to their low velocities it has been argued that these are high-mass stars which formed without a surrounding stellar cluster. In this paper we present an alternative explanation for the origin of these stars in which they formed in a cluster environment but are subsequently dispersed into the field as their natal cluster is tidally disrupted in a merger with a higher-mass cluster. They escape the merged cluster with relatively low velocities typical of the cluster interaction and thus of the larger scale velocity dispersion, similarly to the observed stars. N-body simulations of cluster mergers predict a sizeable population of low velocity (≤20 km s−1), high-mass stars at distances of >20 pc from the cluster. High-mass clusters in which gas poor mergers are frequent would be expected to commonly have halos of young stars, including high-mass stars, that were actually formed in a cluster environment.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Lucas, WE
Rybak, M
Bonnell, IA
Date : 23 November 2017
DOI : 10.1093/mnras/stx2997
Copyright Disclaimer : © 2017 The Authors. This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, Published by Oxford University Press on behalf of the Royal Astronomical Society.
Uncontrolled Keywords : stars: formation – stars: massive – stars: luminosity function, mass function – open clusters and associations: general
Depositing User : Melanie Hughes
Date Deposited : 30 Nov 2017 14:36
Last Modified : 16 Jan 2019 19:05

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