On the derivation of electron density and temperature from S II and O II forbidden line intensity ratios
Abstract
Forbidden line intensity ratios for S II and O II due to collisional de-excitation are discussed. Comparison is made between various reaction rate parameters presented by separate investigators. Included are observations of ratios obtained from the Orion nebula which experimentally confirm the reaction rates of Pradhan as best representing the observed distribution of these ratios. Forbidden O II and forbidden S II contour plots are also presented, which allow effective electron temperatures and densities to be estimated from pairs of line ratios.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- December 1980
- DOI:
- 10.1093/mnras/193.4.911
- Bibcode:
- 1980MNRAS.193..911C
- Keywords:
-
- Astronomical Spectroscopy;
- Electron Density (Concentration);
- Electron Energy;
- Forbidden Transitions;
- Planetary Nebulae;
- Line Spectra;
- Orion Nebula;
- Oxygen Spectra;
- Reaction Kinetics;
- Sulfur;
- Astrophysics