TY - JOUR
T1 - The binary star population of the young cluster NGC 1818 in the Large Magellanic Cloud
AU - Elson, Rebecca A.W.
AU - Sigurdsson, Steinn
AU - Davies, Melvyn
AU - Hurley, Jarrod
AU - Gilmore, Gerard
PY - 1998/11/1
Y1 - 1998/11/1
N2 - 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 A/primary ∼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.
AB - 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 A/primary ∼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.
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U2 - 10.1111/j.1365-8711.1998.t01-1-01948.x
DO - 10.1111/j.1365-8711.1998.t01-1-01948.x
M3 - Article
AN - SCOPUS:0006166708
SN - 0035-8711
VL - 300
SP - 857
EP - 862
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 3
ER -