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Meaning of A star

A star

Pronunciation: [key]
— Astron. Astron.
  1. a blue to white star, as Altair, Sirius, or Vega, having a surface temperature between 7500 and 10,000 K and an absorption spectrum dominated by Balmer-series lines of hydrogen. Cf. spectral type.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.