Forbidden lines from inhomogeneous nebulae - The case of a density distribution of the form N inversely proportional to the square of R

Details Forbidden lines from inhomogeneous nebulae - The case of a density distribution of the form N inversely proportional to the square of R Forbidden lines from inhomogeneous nebulae - The case of a density distribution of the form N inversely proportional to the square of R

Sep 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....43...93p&link_type=abstract

Astronomy and Astrophysics, vol. 43, no. 1, Sept. 1975, p. 93-100.

Astronomy and Astrophysics

Astrophysics

5

Density Distribution, Electron Density (Concentration), Electron Energy, Forbidden Bands, Nebulae, Abundance, Astronomical Models, Gas Ionization, Hydrogen, Temperature Distribution

Scientific paper

The formation of forbidden lines in a nebula with density inversely proportional to the square of r is considered. We show that the forbidden-line-intensity ratios (FLIR) may mimic those of constant density nebulae, whose physical conditions differ considerably from the actual ones. The limits of a FLIR analysis in terms of a constant density model are discussed. We find that a self-consistent analysis is necessary for a correct interpretation of FLIR data, otherwise quite misleading results may be obtained: i.e., overestimate of the minimum density and the electron temperature, underestimate of the maximum density and the abundances relative to hydrogen, ad hoc ionization structure.

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