Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....39...43s&link_type=abstract
Astronomy and Astrophysics, vol. 39, no. 1, Feb. 1975, p. 43-60.
Astronomy and Astrophysics
Astrophysics
73
Abundance, Forbidden Bands, H Ii Regions, Hydrogen Ions, Infrared Spectra, Line Spectra, Planetary Nebulae, Emissivity, Mass Ratios, Oxygen, Self Absorption, Sulfur
Scientific paper
Emissivity coefficients are calculated as functions of electron density and temperature for the IR forbidden lines between 2 and 300 microns of the elements and ionization stages most abundant in H II regions and planetary nebulae. The effect of self-absorption is investigated, and a method is presented for estimating when self-absorption may be important. The IR line spectrum of the Orion Nebula is predicted using the emissivity coefficients, and ionic abundances are derived for the Ar III, S IV, and Ne II forbidden lines in a number of planetary nebulae. The sulfur abundance and sulfur/oxygen ratio are discussed for H II regions and planetary nebulae. The average sulfur/oxygen ratio is found to be about 0.05 for gaseous nebulae.
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