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Paper: Optically Thin versus Optically Thick Ultracompact HII Regions: A Comparative Study
Volume: 267, Hot Star Workshop III: the Earliest Stages of Massive Star Birth
Page: 339
Authors: Barbosa, C. L.; Damineli, A.
Abstract: The ultracompact (UC) HII regions are classified as optically thin or optically thick at radio wavelengths depending on the flatness of the spectral energy distribution at long wavelengths. We present a comparative study between the two classes that we made reviewing their near-infrared properties, taken from the literature.
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