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.
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机译：我们重新审查了最近的建议的光谱学基础，即来自Orion H II区域的[O I]和[Fe II]谱线是在气体中产生的，这些气体中的铁载运颗粒已被破坏，电子密度令人惊讶地高。我们的新观察结果表明，先前[O I] 5577的检测主要由碲发射引起。我们的极限与中等密度（≈10〜4 cm〜（-3））的光电离气体一致。我们表明，先前提出的Orion H II区模型重现了观察到的[O I]和[Fe II]光谱。这些线与在中等密度的尘土区域中的形成完全一致。
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