The Dwarf Blue Compact Galaxies

Details The Dwarf Blue Compact Galaxies The Dwarf Blue Compact Galaxies

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980msngr..22....1a&link_type=abstract

The Messenger, No.22, P. 1, 1980

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

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 H1I region. That is why they have been called extragalactic HII 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.

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