Journal Article

The binary star population of the young cluster NGC 1818 in the Large Magellanic Cloud

Rebecca A. W. Elson, Steinn Sigurdsson, Melvyn Davies, Jarrod Hurley and Gerard Gilmore

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 300, issue 3, pages 857-862
Published in print November 1998 | ISSN: 0035-8711
Published online November 1998 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-8711.1998.t01-1-01948.x
The binary star population of the young cluster NGC 1818 in the Large Magellanic Cloud

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Abstract

We determine the binary star fraction as a function of radius in NGC 1818, a young rich cluster in the Large Magellanic Cloud, using Hubble Space Telescope images in bands F336W (∼U) and F555W (∼V). Our sample includes binaries with Mprimary ∼ 2–5.5 M⊙ and Msecondary ≳ 0.7Mprimary. The binary fraction increases towards the cluster centre, from ∼20 ± 5 per cent in the outer parts, to ∼35 ± 5 per cent inside the core. This increase is consistent with dynamical mass segregation and need not be primordial. We compare our results with expectations from N-body models, and discuss the implications for the formation and early evolution of such clusters.

Keywords: binaries: general; globular clusters: individual: NGC 1818; magellanic clouds; galaxies: star clusters

Journal Article.  0 words. 

Subjects: Astronomy and Astrophysics

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