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Patrick, LR, Evans, CJ, Davies, B, Kudritzki, R-P, Gazak, JZ, Bergemann, M, Plez, B and Ferguson, AMN (2015) RED SUPERGIANT STARS AS COSMIC ABUNDANCE PROBES: KMOS OBSERVATIONS IN NGC 6822. ASTROPHYSICAL JOURNAL, 803 (1). ISSN 0004-637X
Full text not available from this repository. Please see publisher or open access link below:Abstract
We present near-IR spectroscopy of red supergiant (RSG) stars in NGC 6822, obtained with the new K-band Multi-Object Spectrograph Very Large Telescope, Chile. From comparisons with model spectra in the J-band we determine the metallicity of 11 RSGs, finding a mean value of [Z] = −0.52 ± 0.21, which agrees well with previous abundance studies of young stars and H ii regions. We also find an indication for a low-significance abundance gradient within the central 1 kpc. We compare our results with those derived from older stellar populations and investigate the difference using a simple chemical evolution model. By comparing the physical properties determined for RSGs in NGC 6822 with those derived using the same technique in the Galaxy and the Magellanic Clouds, we show that there appears to be no significant temperature variation of RSGs with respect to metallicity, in contrast to recent evolutionary models.
| 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 12:43 |
| Last Modified: | 03 Sep 2021 23:31 |
| DOI or ID number: | 10.1088/0004-637X/803/1/14 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/6236 |
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