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

Gazak, JZ, Kudritzki, R, Evans, C, Patrick, L, Davies, B, Bergemann, M, Plez, B, Bresolin, F, Bender, R, Wegner, M, 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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