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O star

[oh stahr] /ˈoʊ ˌstɑr/
noun
1.
a very hot, massive, blue star of spectral type O, having a surface temperature between 30,000 and 50,000 K and an absorption spectrum with few lines, though the Balmer series of hydrogen lines is present and lines of ionized helium are detectable.
Compare spectral type.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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