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B star

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WordReference Random House Unabridged Dictionary of American English © 2026

B star, [Astron.]

Astronomya massive, relatively hot, blue to white star, as Rigel or Spica, having a surface temperature between 10,000 and 30,000 K and with an absorption spectrum dominated by the Balmer series of hydrogen with lines of neutral helium present. Cf. spectral type.

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