Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 428, Issue 3, Pages 2216-2231Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sts188
Keywords
stars: carbon; galaxies: distances and redshifts; galaxies: individual: NGC 6822; Local Group; infrared: stars; stars: AGB and post; AGB
Categories
Funding
- National Research Foundation (NRF) of South Africa
- National Astrophysics and Space Science Programme (NASSP) of South Africa
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JHK(S) photometry is presented from a 3.5 yr survey of the central regions of the irregular galaxy NGC 6822. The morphology of the colour-magnitude and colour-colour diagrams is discussed with particular reference to M-, S- and C-type asymptotic giant branch (AGB) stars and to M supergiants. Mean JHK(S) magnitudes and periods are given for 11 O-rich and 50 presumed C-rich Miras. Data are also listed for 27 large-amplitude AGB stars without periods and for 69 small-amplitude AGB variables. The slope of the bolometric period-luminosity relation for the C-rich Miras is in good agreement with that in the Large Magellanic Cloud. Distance moduli derived from the C- and O-rich Miras are in agreement with other estimates. The period distribution of C-rich Miras in NGC 6822 is similar to that in the Magellanic Clouds, but differs from that in the dwarf spheroidals in the Local Group. In the latter there is a significant proportion of large-amplitude, short-period variables indicating a population producing old carbon-rich AGB stars.
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