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Physical properties of the first spectroscopically confirmed red supergiant stars in the Sculptor Group galaxy NGC 55

Patrick, LR and Evans, CJ and Davies, B and Kudritzki, R-P and Ferguson, AMN and Bergemann, M and Pietrzynski, G and Turner, O (2017) Physical properties of the first spectroscopically confirmed red supergiant stars in the Sculptor Group galaxy NGC 55. Monthly Notices of the Royal Astronomical Society, 468 (1). pp. 492-500. ISSN 0035-8711

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Abstract

We present K-band Multi-Object Spectrograph (KMOS) observations of 18 red supergiant (RSG) stars in the Sculptor Group galaxy NGC 55. Radial velocities are calculated and are shown to be in good agreement with previous estimates, confirming the supergiant nature of the targets and providing the first spectroscopically confirmed RSGs in NGC 55. Stellar parameters are estimated for 14 targets using the J-band analysis technique, making use of state-of-the-art stellar model atmospheres. The metallicities estimated confirm the low-metallicity nature of NGC 55, in good agreement with previous studies. This study provides an independent estimate of the metallicity gradient of NGC 55, in excellent agreement with recent results published using hot massive stars. In addition, we calculate luminosities of our targets and compare their distribution of effective temperatures and luminosities to that of other RSGs, in different environments, estimated using the same technique.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 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: 12 May 2017 10:48
Last Modified: 06 Sep 2017 19:02
DOI or Identification number: 10.1093/mnras/stx410
URI: http://researchonline.ljmu.ac.uk/id/eprint/6412

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