OB star
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Related on Lably
Through Star, Stellar classification and Ionization
In lists of spectra the "spectrum of OB" refers to "unknown, but belonging to an OB association so thus of early type".

Related on Lably
Through Star, Stellar classification and Ionization
In lists of spectra the "spectrum of OB" refers to "unknown, but belonging to an OB association so thus of early type".