Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-08-04
AIP Conf.Proc.752:161-174,2005
Astronomy and Astrophysics
Astrophysics
Invited talk at the first international workshop on "Stellar Astrophysics with the World's Largest Telescopes", Torun, Poland,
Scientific paper
10.1063/1.1893349
The characteristics and properties of the stellar populations and evolutionary histories of Local Group galaxies are summarized and compared to predictions of cosmological models. No clear signature of the re-ionization epoch is observed; in particular, there is no cessation of star formation activity in low-mass dwarf galaxies at the end of re-ionization. Arguments against the morphological transformation of dwarf irregular into dwarf spheroidal galaxies are derived from their pronounced evolutionary differences at early epochs as evidenced by the offset in the metallicity-luminosity relation between gas-rich and gas-poor dwarfs. While there is increasing evidence for past and ongoing accretion events the overall importance of dwarf galaxies as building blocks remains unclear considering their differences in modes of star formation and detailed chemistry.
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