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Physical Conditions in Low Ionization Regions of the Orion NebulaWe 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. 10(exp 4)/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.
Document ID
19960018490
Acquisition Source
Ames Research Center
Document Type
Contractor Report (CR)
Authors
Baldwin, J. A. (Kentucky Univ. Lexington, KY United States)
Crotts, A. (Kentucky Univ. Lexington, KY United States)
DuFour, R. J. (Kentucky Univ. Lexington, KY United States)
Ferland, G. J. (Kentucky Univ. Lexington, KY United States)
Heathcote, S. (Kentucky Univ. Lexington, KY United States)
Hester, J. J. (Kentucky Univ. Lexington, KY United States)
Korista, K. T. (Kentucky Univ. Lexington, KY United States)
Martin, P. J. (Kentucky Univ. Lexington, KY United States)
ODell, C. R. (Kentucky Univ. Lexington, KY United States)
Date Acquired
September 6, 2013
Publication Date
April 15, 1996
Subject Category
Astrophysics
Report/Patent Number
NAS 1.26:200783
NASA-CR-200783
Accession Number
96N23767
Funding Number(s)
CONTRACT_GRANT: NCC2-5028
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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