Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...425l...9g&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 425, no. 1, p. L9-L12
Astronomy and Astrophysics
Astronomy
31
Asymptotic Giant Branch Stars, Cosmology, Dwarf Galaxies, Galactic Evolution, Irregular Galaxies, Late Stars, Local Group (Astronomy), Stellar Composition, Stellar Evolution, Color-Magnitude Diagram, Hertzsprung-Russell Diagram, Photometry, Stellar Color, Stellar Luminosity, Stellar Spectra
Scientific paper
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.
Aparicio Antonio
Bertelli Giampaolo
Chiosi Cesare
Gallart Carme
Vilchez José M.
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