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Chemistry and kinematics of red supergiant stars in the young massive cluster NGC 2100

Patrick, LR and Evans, CJ and Davies, B and Kudritzki, R-P and Henault-Brunet, V and Bastian, N and Lapenna, E and Bergemann, M (2016) Chemistry and kinematics of red supergiant stars in the young massive cluster NGC 2100. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 458 (4). pp. 3968-3976. ISSN 0035-8711

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Open Access URL: https://arxiv.org/pdf/1602.02702 (Accepted version)

Abstract

We have obtained K-band Multi-Object Spectrograph (KMOS) near-IR spectroscopy for 14 red supergiant stars (RSGs) in the young massive star cluster NGC 2100 in the Large Magellanic Cloud (LMC). Stellar parameters including metallicity are estimated using the J-band analysis technique, which has been rigorously tested in the Local Universe. We find an average metallicity for NGC 2100 of [Z] = −0.43 ± 0.10 dex, in good agreement with estimates from the literature for the LMC. Comparing our results in NGC 2100 with those for a Galactic cluster (at Solar-like metallicity) with a similar mass and age we find no significant difference in the location of RSGs in the Hertzsprung–Russell diagram. We combine the observed KMOS spectra to form a simulated integrated-light cluster spectrum and show that, by analysing this spectrum as a single RSG, the results are consistent with the average properties of the cluster. Radial velocities are measured for the targets and the dynamical properties are estimated for the first time within this cluster. The data are consistent with a flat velocity dispersion profile, and with an upper limit of 3.9 kms−1, at the 95 per cent confidence level, for the velocity dispersion of the cluster. However, the intrinsic velocity dispersion is unresolved and could, therefore, be significantly smaller than the upper limit reported here. An upper limit on the dynamical mass of the cluster is derived as Mdyn ≤ 15.2 × 104 M⊙ assuming virial equilibrium.

Item Type: Article
Additional Information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record Mon Not R Astron Soc (2016) 458 (4): 3968-3976. is available online at: https://doi.org/10.1093/mnras/stw561
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: OXFORD UNIV PRESS
Related URLs:
Date Deposited: 10 Apr 2017 09:55
Last Modified: 10 Apr 2017 10:58
DOI or Identification number: 10.1093/mnras/stw561
URI: http://researchonline.ljmu.ac.uk/id/eprint/6231

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