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Photometric metallicity map of the Large Magellanic Cloud


Choudhury, S and Subramaniam, A and Cole, AA, Photometric metallicity map of the Large Magellanic Cloud, Monthly Notices of the Royal Astronomical Society, 455, (2) pp. 1855-1880. ISSN 0035-8711 (2016) [Refereed Article]


Copyright Statement

Copyright 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

DOI: doi:10.1093/mnras/stv2414


We have estimated a metallicity map of the Large Magellanic Cloud (LMC) using the Magellanic Cloud Photometric Survey (MCPS) and Optical Gravitational Lensing Experiment (OGLE III) photometric data. This is a first of its kind map of metallicity up to a radius of 4°–5°, derived using photometric data and calibrated using spectroscopic data of Red Giant Branch (RGB) stars. We identify the RGB in the V, (VI) colour–magnitude diagrams of small subregions of varying sizes in both data sets. We use the slope of the RGB as an indicator of the average metallicity of a subregion, and calibrate the RGB slope to metallicity using spectroscopic data for field and cluster red giants in selected subregions. The average metallicity of the LMC is found to be [Fe/H] = −0.37 dex (σ[Fe/H] = 0.12) from MCPS data, and [Fe/H] = −0.39 dex (σ[Fe/H] = 0.10) from OGLE III data. The bar is found to be the most metal-rich region of the LMC. Both the data sets suggest a shallow radial metallicity gradient up to a radius of 4 kpc (−0.049 ± 0.002 dex kpc−1 to −0.066 ± 0.006 dex kpc−1). Subregions in which the mean metallicity differs from the surrounding areas do not appear to correlate with previously known features; spectroscopic studies are required in order to assess their physical significance

Item Details

Item Type:Refereed Article
Keywords:stars: abundances, Hertzsprung–Russell and colour, magnitude diagrams, galaxies: abundances, Magellanic Clouds
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Cole, AA (Professor Andrew Cole)
ID Code:107648
Year Published:2016
Web of Science® Times Cited:40
Deposited By:Mathematics and Physics
Deposited On:2016-03-21
Last Modified:2017-11-01
Downloads:240 View Download Statistics

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