Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978rbrfi...8..595a&link_type=abstract
Revista Brasileira de Fisica, vol. 8, Dec. 1978, p. 595-620.
Astronomy and Astrophysics
Astronomy
8
Crab Nebula, Emission Spectra, Ionizing Radiation, Radiative Transfer, Supernova Remnants, Astronomical Models, Astronomical Spectroscopy, Filaments, H Ii Regions, Helium, Line Spectra
Scientific paper
A detailed program for calculating the transfer of ionizing radiation in a diffuse medium is presented in which the equations of thermal balance and ionization equilibrium are solved. This program makes it possible to build models of various types of object, such as galactic nuclei, supernova remnants, H II regions, or planetary nebulae, and also to calculate their emission-line spectra. Application of this program to the Crab Nebula, a supernova remnant with well-observed filamentary structure, indicates that a detailed model of this object should attempt to depict individual filaments (which have different densities and lie at different distances from the ionizing source) rather than a 'mean' filament. The 4686-A He II line, which is predicted to be much weaker than observed in all previous models, seems to originate not only from the filaments but also from the diffuse medium in which the filaments are immersed.
Aldrovandi M. V. S.
Stasinska Grazina
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