Ionization Structure and Spectra of Iron in Gaseous Nebulae

Details Ionization Structure and Spectra of Iron in Gaseous Nebulae Ionization Structure and Spectra of Iron in Gaseous Nebulae

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001rmxac..11..165b&link_type=abstract

"IX Latin American Regional IAU Meeting, "Focal Points in Latin American Astronomy", held in Tonantzintla, Mexico, Nov 9-13, 199

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a study of the emission spectra and the ionization structure of FeI--IV in gaseous nebulae. This work includes: (I) new atomic data; (II) a study of excitation mechanisms of [FeII], [FeIII], and [FeIV] lines, and spectroscopic analysis of observed spectra; (III) a study of the physical structure and kinematics of nebulae and their ionization fronts. Spectral analysis of the Orion nebula is carried out as a test case. It is shown that the [FeII] emission from Orion is predominantly excited via electron collisions in high density partially ionized zones; radiative fluorescence is relatively less effective. Further evidence for high density zones is derived from measured velocities of the flow in the nebula. Photoionization models also indicate that the optical [OI] and [FeII] emission originates in high density regions within ionization fronts.

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