Physical Conditions in Low Ionization Regions of the Orion Nebula

Details Physical Conditions in Low Ionization Regions of the Orion Nebula Physical Conditions in Low Ionization Regions of the Orion Nebula

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996uky..rept.....b&link_type=abstract

Technical Report, Kentucky Univ. Lexington, KY United States Dept. of Physics and Astronomy.

Astronomy and Astrophysics

Astronomy

Orion Nebula, H Ii Regions, Line Spectra, Spaceborne Astronomy, Iron, Abundance, Gas Ionization, Interstellar Gas, Cosmic Dust, Ultraviolet Astronomy, Photoionization, Oxygen, Hubble Space Telescope, Mass Ratios, Ionized Gases, Electron Density (Concentration), Emission Spectra, Spectroscopic Telescopes

Scientific paper

We reexamine the spectroscopic underpinnings of recent claims that low ionization (O(I)) and (Fe(II)) lines from the Orion H(II) region are produced in a region where the iron-carrying grains have been destroyed and the electron density is surprisingly high. Our new HST and CTIO observations show that previous reported detections of(O(I)) lambda 5577 were strongly affected by telluric emission. Our line limits consistent with a moderate density (approx. 104/cu. cm photoionized gas. We show that a previously proposed model of the Orion H(II) region reproduces the observed (O(I)) and (Fe(II)) spectrum. These lines are fully consistent with formation in a moderate density dusty region.

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