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- W68991818 abstract "Among the very different types of galaxies which can be analysed, the dwarf blue compact galaxies have been first recognized as a class by Sargent and Searle (1970: Astrophysical Journal. 162,455). Some important properties let them be priceless tools to enlighten many basic astrophysical problems, such as the primordial nucleosynthesis and cosmology, the chemical evolution of galaxies and the theories of star formation. These galaxies are generally dwarf irregular objects with low mass but the bulk of the luminosity is in the blue range. Their spectra look strikingly like those of a giant H 1I region. That is why they have been called extragalactic H II region by Sargent and Searle. From their emission lines it is rather straightforward to derive their He, N, 0, Ne and possibly S conten!. Some of these abundances, including some of our own results obtained at La Silla, are summarized in Section 3. Finally we will show the most important implications of results deduced from the study of these galaxies: (i) Their weak metaliicity can be correlated with their high atomic hydrogen content and their blue luminosity. These objects are especially important for galactic evolution models, because they appear to be much less evolved galaxies than ours and because they also show obvious signs of recent bursts of star formation. (ii) From the comparison between their helium and their metal content we can deduce the primordial abundance in helium. This is one of the basic parameters to select among the many possible cosmological models describing the early phases of the Universe. Moreover and within the canonical Big Bang model it could provide some insight on a few characteristics of the physics of elementary particles, such as the number of different classes of not yet observed leptons. 2. The Morphology of the Blue Compact Galaxies" @default.
- W68991818 created "2016-06-24" @default.
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- W68991818 date "1980-12-01" @default.
- W68991818 modified "2023-09-24" @default.
- W68991818 title "The Dwarf Blue Compact Galaxies" @default.
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