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JHKs photometry is presented from a 3.5 year survey of the central regions ofthe irregular galaxy NGC6822. The morphology of the colour-magnitude andcolour-colour diagrams is discussed with particular reference to M, S andC-type AGB stars and to M-supergiants. Mean JHKs magnitudes and periods aregiven for 11 O-rich and 50 presumed C-rich Miras. Data are also listed for 27large amplitude AGB stars without periods and for 69 small amplitude AGBvariables. The slope of the bolometric period-luminosity relation for theC-rich Miras is in good agreement with that in the LMC. Distance moduli derivedfrom the C- and O-rich Miras are in agreement with other estimates. The perioddistribution of C-rich Miras in NGC6822 is similar to that in the MagellanicClouds, but differs from that in the dwarf spheroidals in the Local Group. Inthe latter there is a significant proportion of large amplitude, short periodvariables indicating a population producing old carbon-rich AGB stars.

The Local Group Galaxy NGC 6822 and its Asymptotic Giant Branch Stars