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Red Supergiants as Cosmic Abundance Probes: The Sculptor Galaxy NGC 300

We present a quantitative spectroscopic study of twenty-seven red supergiants in the Sculptor Galaxy NGC 300. J-band spectra were obtained using KMOS on the VLT 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 red supergiant stars beyond the Local Group of galaxies and reveals the great potential of this technique.

preprint2015arXivOpen access
J. Zachary GazakRolf KudritzkiChris EvansLee PatrickBen DaviesMaria BergemannBertrand PlezFabio BresolinRalf BenderMichael WegnerAlceste Z. BonanosStephen J. Williams
astro-ph.GA
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J. Zachary GazakRolf KudritzkiChris EvansLee PatrickBen DaviesMaria BergemannBertrand PlezFabio BresolinRalf BenderMichael WegnerAlceste Z. BonanosStephen J. Williams

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