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Descibe the relation of hot stars to H I (neutral hydrogen) and H II (ionized hydrogen)...

Descibe the relation of hot stars to H I (neutral hydrogen) and H II (ionized hydrogen) regions.

Science   Advanced-Physics   
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Answer #1

The Cool gas, also called HI regions because the hydrogen gas is neutral, not ionized.

Whereas, the cloud of gas and dust lying close to a hot star that ionizes the hydrogen in the cloud. Also called "HII Regions" -- HII means hydrogen atoms with their electrons gone (HI means regular hydrogen). These nebulae look red in color because hydrogen has a strong emission line in the red part of the spectrum. O or B stars are the only stellar types hot enough to create HII regions.

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