Red Supergiant Stars as Cosmic Abundance Probes : Kmos Observations in Ngc 6822

Content Provider	Semantic Scholar
Author	Patrick, Lyn R. Davies, Ben Bergemann, Maria Plez, Bertrand
Copyright Year	2014
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.
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Alternate Webpage(s)	http://www.ifa.hawaii.edu/publications/preprints/14preprints/Patrick_14-220.pdf
Alternate Webpage(s)	https://www.research.ed.ac.uk/portal/files/25671924/Supergiants.pdf
Language	English
Access Restriction	Open
Subject Keyword	Astronomy COSMIC CSPG5 gene Decade (log scale) Dex Dexamethasone Distance Erythrocytes Estimated Evolutionary algorithm GUCY2C protein, human Galaxy morphological classification Gradient Large Leucetta sp. CB3 Liverpool Magellanic Catalogue of Stars Medical Subject Headings New General Catalogue Photometry Population Pure Red-Cell Aplasia Reticulate acropigmentation of Kitamura Stars, Celestial Stellar (payment network) Stellar classification Stochastic gradient descent Verification of Theories Virtual Link Trunking
Content Type	Text
Resource Type	Article