Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....78..200a&link_type=abstract
Astronomy and Astrophysics, vol. 78, no. 2, Sept. 1979, p. 200-216.
Astronomy and Astrophysics
Astrophysics
247
Abundance, Galactic Evolution, Galaxies, Interstellar Gas, Nitrogen, Oxygen, Chemical Evolution, Galactic Nuclei, Gas Temperature, H Ii Regions, Interstellar Magnetic Fields, Line Spectra, Magellanic Clouds, Markarian Galaxies, Spectral Energy Distribution, Spiral Galaxies, Surface Temperature, Temperature Gradients
Scientific paper
Nitrogen and oxygen abundances are computed for galactic and extragalactic low-temperature H II regions by using a semiempirical relation between line intensities and temperature. The results are interpreted in terms of galactic evolution on the basis of a chemical model. The study confirms that certain relations previously obtained for high-excitation underabundant H II regions extend to low-excitation overabundant regions. It is found that the nuclear regions of spiral and Markarian galaxies of H II type present a large range of abundances and constitute a very heterogeneous class and that there are small differences in the initial mass function among galaxies. In particular, irregular galaxies are shown to have an initial mass function that has the same slope for stars more massive than 1 solar mass but contains more lower-mass stars than the local function.
Alloin Danielle
Collin-Souffrin Suzy
Joly Monique
Vigroux Laurant
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