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RED SUPERGIANTS AS COSMIC ABUNDANCE PROBES: THE SCULPTOR GALAXY NGC 300

Gazak, JZ and Kudritzki, R and Evans, C and Patrick, L and Davies, B and Bergemann, M and Plez, B and Bresolin, F and Bender, R and Wegner, M and Bonanos, AZ and Williams, SJ (2015) RED SUPERGIANTS AS COSMIC ABUNDANCE PROBES: THE SCULPTOR GALAXY NGC 300. ASTROPHYSICAL JOURNAL, 805 (2). ISSN 0004-637X

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Open Access URL: https://arxiv.org/pdf/1505.00871 (Accepted version)

Abstract

We present a quantitative spectroscopic study of 27 red supergiants (RSGs) in the Sculptor Galaxy NGC 300. J-band spectra were obtained using KMOS on the Very Large Telescope and studied with state of the art synthetic spectra including NLTE corrections for the strongest diagnostic lines. We report a central metallicity of [Z] = −0.03 ± 0.05 with a gradient of −0.083 ± 0.014 [dex/kpc], in agreement with previous studies of blue supergiants and H ii-region auroral line measurements. This result marks the first application of the J-band spectroscopic method to a population of individual RSG stars beyond the Local Group of galaxies and reveals the great potential of this technique.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural)
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: IOP PUBLISHING LTD
Related URLs:
Date Deposited: 10 Apr 2017 12:27
Last Modified: 10 Apr 2017 12:27
DOI or Identification number: 10.1088/0004-637X/805/2/182
URI: http://researchonline.ljmu.ac.uk/id/eprint/6233

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