2016MNRAS.455.1855C -
Mon. Not. R. Astron. Soc., 455, 1855-1880 (2016/January-2)
Photometric metallicity map of the Large Magellanic Cloud.
CHOUDHURY S., SUBRAMANIAM A. and COLE A.A.
Abstract (from CDS):
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, (V - I) 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 to -0.066±0.006 dex/kpc). 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.
Abstract Copyright:
© 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)
Journal keyword(s):
stars: abundances - Hertzsprung-Russell and colour-magnitude diagrams - galaxies: abundances - Magellanic Clouds
Simbad objects:
10
Full paper
View the references in ADS
To bookmark this query, right click on this link: simbad:2016MNRAS.455.1855C and select 'bookmark this link' or equivalent in the popup menu