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O star



Pronunciation: (ō' stär"), [key]
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.Cf. spectral type.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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