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OB stars are hot,massive stars of spectral typesO orearly-typeB that form in loosely organized groups calledOB associations. They are short lived, and thus do not move very far from where they formed within their life. During their lifetime, they will emit muchultraviolet radiation. This radiation rapidlyionizes the surroundinginterstellar gas of thegiant molecular cloud, forming anH II region orStrömgren sphere.
In lists of spectra the "spectrum of OB" refers to "unknown, but belonging to an OB association so thus of early type".[dubious –discuss]
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