Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103..834r&link_type=abstract
(Rice University and University of Texas, Texas-Mexico Conference on Astrophysics: Plasmas in Astrophysics, 3rd, Rice University
Astronomy and Astrophysics
Astrophysics
30
Astronomical Models, Ionized Gases, Orion Nebula, Abundance, Emission Spectra, Iron, Line Of Sight, Line Spectra, Symmetry
Scientific paper
The ionized gas in the Orion nebula is examined by means of axisymmetric modeling that is based on observational data from the ionized, neutral, and molecular regions. Nonsymmetrical features are omitted, radial dependence from the Trapezium is assumed, and azimuthal symmetry in the plane of the sky is used. Stellar properties and abundances of certain elements are described, and these data are used to compare the present axisymmetric-blister model to a previous spherical model. Strong singly-ionized emission that are visible near the Trapezium are found to originate in the ionization-bounded region in the dense Trapezium zone. The model can be more tightly constrained by adding near-IR data on noncentral zones for (Ar II), (AR III), (Ne II), and (S IV). The quadrant with the 'bar' creates an nonsymmetry that influences the observational data, and the model can therefore be improved with the additional data.
Erickson Edwin F.
Haas Michael R.
Rubin Robert H.
Simpson Janet P.
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