The structure of ionization fronts in H II regions

Details The structure of ionization fronts in H II regions The structure of ionization fronts in H II regions

Oct 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974mnras.169...97s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 169, Oct. 1974, p. 97-116.

Astronomy and Astrophysics

Astronomy

22

Emission Spectra, Gas Ionization, H Ii Regions, Interstellar Gas, Nebulae, Balmer Series, Brightness, Electron Density Profiles, Electron Energy, Forbidden Bands, Interstellar Extinction, Line Spectra, Nonequilibrium Ionization, Spectral Line Width

Scientific paper

Spectra have been obtained of bright rim structures in four nearby emission nebulae, NGC 1976, NGC 2264, NGC 6820, and IC 1396. These spectra have been calibrated to give relative line strengths. The Balmer decrement is found to be quite constant across the bright rims indicating that collisional excitation is not important and that the internal reddening is fairly constant. From the Balmer decrement the reddening of the objects is determined and the forbidden lines are used to obtain the variation of the electron density, electron temperature, and level of ionization across the bright rims. It was found that the densities at the ionization fronts agree with the calculations but the variation of density across the rims differs from the theory in one case.

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