Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-07-08
Astronomy and Astrophysics
Astrophysics
12 pages, latex (aaspp4.sty), 1 figure. To appear in ApJ Letters
Scientific paper
10.1086/310245
We reexamine the spectroscopic underpinnings of recent suggestions that [O I] and [Fe II] lines from the Orion H II region are produced in gas where the iron-carrying grains have been destroyed and the electron density is surprisingly high. Our new observations show that previous detections of [O I] 5577 were dominated by telluric emission. Our limits are consistent with a moderate density (10^4 cm^{-3}) 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 dusty region of moderate density.
Baldwin John A.
Crotts Arlin
Dufour Reginald James
Ferland Gary J.
Heathcote Stephen
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