Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 480, Issue 2, Pages 1689-1695Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty1958
Keywords
instrumentation: adaptive optics; techniques: imaging spectroscopy; stars: kinematics and dynamics; stars: rotation; galaxies: star clusters: individual: NGC 419
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Funding
- European Research Council [ERC-CoG-646928-Multi-Pop]
- Bundesministerium fuer Bildung und Forschung(BMBF)-Verbundforschung [05A17BAA]
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We present adaptive optics (AO)-assisted integral-field spectroscopy of the intermediate-age star cluster NGC 419 in the Small Magellanic Cloud. By investigating the cluster dynamics and the rotation properties of main-sequence turn-off (MSTO) stars, we demonstrate the power of AO-fed MUSE observations for this class of objects. Based on 1 049 radial velocity measurements, we determine a dynamical cluster mass of 1.4 +/- 0.2 x 10(5) M-circle dot and a dynamical mass-to-light ratio of 0.67 +/- 0.08, marginally higher than simple stellar population predictions for a Kroupa initial mass function. A stacking analysis of spectra at both sides of the extended MSTO reveals significant rotational broadening. Our analysis further provides tentative evidence that red MSTO stars rotate faster than their blue counterparts. We find average Vsin i values of 87 +/- 16 and 130 +/- 22 km s(-1) for blue and red MSTO stars, respectively. Potential systematic effects due to the low-spectral resolution of MUSE can reach 30 km s(-1) but the difference in Vsin i between the populations is unlikely to be affected.
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