In Stellar Astrophysics with the World's Largest
Telescopes, AIP Conference Proceedings, Vol. 752, eds. J. Mikolaewska
& A. Olech (New York: American Institute of Physics), p.161-174, 2005.
For a PDF version of the article, click
For a PDF version of the article, click here.
Abstract. 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.
Keywords Dwarf galaxies (elliptical, irregular, and spheroidal) - Magellanic Clouds and other irregular galaxies - Origin, formation, evolution, age, and star formation - Chemical composition and chemical evolution - Stellar content and populations; radii; morphology and overall structure - Galactic halos.
Table of Contents