Asymptotic giant branch stars in NGC 6822: Probes of star formation history

Bibcode
1994ApJ...425L...9G
DOI
10.1086/187298
Gallart, C.; Aparicio, A.; Chiosi, C.; Bertelli, G.; Vilchez, J. M.
Bibliographical reference

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 425, no. 1, p. L9-L12

Advertised on:
4
1994
Journal
Astrophysical Journal
Number of authors
5
IAC number of authors
3
Citations
32
Refereed citations
25
Description
About 500 asymptotic giant branch (AGB) stars have been resolved and photometrically measured in the Local Group (LG) dwarf irregular galaxy NGC 6822. They draw an AGB well shaped, densely populated, and extending to very red colors. It is the first time that this kind of AGB has been clearly detected. Using recent stellar evolutionary models and isochrones, we discuss the stellar population of the galaxy, showing, in particular, how the structure of the AGB can be used as an observable to trace the intermediate-age and old star formation history of the galaxy. The powerful telescopes and detectors currently available offer the opportunity of detecting this structure in other nearby galaxies. This opens new paths for the study of the intermediate-age and old populations of the LG.
Type
Refereed
Cosmology
Dwarf galaxies
Irregular galaxies
Stellar composition
Stellar evolution
Photometry

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