Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...277..832t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 277, Feb. 15, 1984, p. 832-840.
Astronomy and Astrophysics
Astrophysics
11
Iron, Line Spectra, Nonequilibrium Ionization, Stellar Coronas, Stellar Models, Supernova Remnants, Abundance, Electron Energy, Ion Temperature, Nebulae, Radial Distribution, Shock Waves, Spectral Energy Distribution, X Ray Spectra
Scientific paper
Intensity distributions of forbidden coronal Fe lines have been computed for Sedov blast-wave models of Cygnus Loop, Puppis A, and IC 443. The models assumed both equilibrium and nonequilibrium collisional ionization. The results show that, at shock speeds over 350 km/s, departures from equilibrium ionization are important in the forbidden Fe intensities, while at slower shock speeds equilibrium calculations are adequate to represent the line intensities. The calculated intensities fail to match observed published observations in spatial distribution and relative intensities. This disagreement supports the view that local conditions at the site of forbidden Fe observations depart from those predicted by blast-wave models. It is concluded that published observations are more closely related to evaporative shock/cloudlet interactions than to direct emission from collisionally ionized Fe in the shock fronts.
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