Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999iaus..192..218t&link_type=abstract
The stellar content of Local Group galaxies, Proceedings of the 192nd symposium of the International Astronomical Union held in
Astronomy and Astrophysics
Astronomy
6
Scientific paper
Deep, precision, multi-colour photometry of resolved stellar populations in external galaxies can uniquely determine the star formation histories of nearby galaxies going back many Gyrs. Hubble Space Telescope and high quality ground based imaging have recently resulted in dramatic Colour-Magnitude Diagrams of the faint old resolved stellar populations in nearby galaxies. Although data deep enough to unambiguously trace back to the very oldest populations does not yet exist (except for a few small dSphs in the Galaxy Halo), these preliminary studies make the potential for deeper data for a range of galaxy types look very exciting. For example, recent results on the very low metallicity dwarf irregular galaxy Leo A suggests we have found a predominantly, if not entirely, young galaxy, less than 2 Gyr old, in the Local Group. Nearby faint star CMDs thus provide an important and independent method to confirm the high redshift galaxy survey predictions of galactic evolution.
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