Infrared atomic hydrogen line formation in luminous stars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Hydrogen Atoms, Infrared Spectra, Line Spectra, Stellar Luminosity, Stellar Spectra, Stellar Winds, Cosmic Dust, H Ii Regions, Hydrogen Ions, Point Sources, Radio Emission, Stellar Atmospheres, Stellar Evolution, Temperature Effects

Scientific paper

Infrared atomic hydrogen lines observed in luminous stars, generally attributed to compact circumstellar H II regions, can also be formed in the winds likely to emanate from these stars. Implications are discussed for the class of obscured infrared point sources showing these lines, and an illustrative model is derived for the BN object in Orion. Such stellar winds should also produce weak, but detectable, radio emission.

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