The metallicity gradient and the stellar distribution within the Local Group dwarf galaxy NGC 6822 has been studied photometrically using asymptotic branch stars ( AGB ) .
In order to study the stellar and metallicity distribution , the carbon- and oxygen-rich AGB stars have been isolated using deep high-quality near-infrared UKIRT photometry .
The ratio between them , the C/M ratio , has been used to derive the [ Fe/H ] abundance within the galaxy .
The [ Fe/H ] abundance and stellar distribution were analysed as a function of galactic radius .
A mean C/M ratio of 0.288 \pm 0.014 has been found which corresponds to an iron abundance of [ Fe/H ] = -1.14 \pm 0.08 dex , with variations in the north and south , as well as at larger galactocentric distances .
Variations in the magnitude of the tip of the red giant branch has also been detected .