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Cluster kinematics and stellar rotation in NGC 419 with MUSE and adaptive optics

Kamann, S, Bastian, N, Husser, T-O, Martocchia, S, Usher, CG, den Brok, M, Dreizler, S, Kelz, A, Krajnovic, D, Richard, J, Steinmetz, M and Weilbacher, PM (2018) Cluster kinematics and stellar rotation in NGC 419 with MUSE and adaptive optics. Monthly Notices of the Royal Astronomical Society, 480 (2). pp. 1689-1695. ISSN 0035-8711

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Abstract

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 1049 radial velocity measurements, we determine a dynamical cluster mass of 1.4±0.2×10 5 M ⊙ 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±22kms −1 for blue and red MSTO stars, respectively. Potential systematic effects due to the low-spectral resolution of MUSE can reach 30kms −1 but the difference in Vsin i between the populations is unlikely to be affected.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2019 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical and Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 14 May 2019 09:16
Last Modified: 14 May 2019 09:16
DOI or Identification number: 10.1093/mnras/sty1958
URI: http://researchonline.ljmu.ac.uk/id/eprint/10681

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