Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....47...49s&link_type=abstract
Astronomy and Astrophysics, vol. 47, no. 1, Feb. 1976, p. 49-52.
Astronomy and Astrophysics
Astrophysics
3
Electron Recombination, H Ii Regions, Hydrogen Ions, Radiative Recombination, Radio Spectra, Absorption Spectra, Abundance, Calcium, Electron Energy, Magnesium
Scientific paper
Theoretical bn factors are calculated for Mg I and Ca I, probably the best candidates for observable radio recombination lines due to dielectric recombination in H II regions. These factors are used to predict possible radio recombination-line intensities for a variety of physical conditions, and more realistic estimates of the intensities of lines generated by H II regions are obtained with a simplified model of the Orion Nebula. The results show that very strong Mg I lines and reasonably strong Ca I lines should be expected from H II regions, provided the assumptions made about physical conditions in such regions are valid. The fact that no such lines have been observed is taken to imply that either the electron temperature is low in the regions where magnesium and calcium are singly ionized or the abundances of atomic magnesium and calcium in H II regions are lower than the cosmic abundances by up to an order of magnitude.
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