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B-Type ○｜Definition｜1st｜20260713140935-00-⌔

B-type main-sequence star - Wikipedia

B-type main-sequence star

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A B-type main-sequence star1 is a main-sequence (core hydrogen -burning) star of spectral type B. The spectral luminosity class is given as V.23 These stars have from 2 to 18 times the mass of the Sun and surface temperatures between about 10,000 and 30,000 K.

B-type stars are luminous and blue-white. Their spectra have strong neutral helium absorption lines, which are most prominent at the B2 subclass, and moderately strong hydrogen lines. Examples include Regulus, Algol A and Acrux.4

Printed 2026-07-13.

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Footnotes

  1. Also called a “B-type dwarf” or “blue-white dwarf” ↩

  2. “Glossary term: Luminosity Class”. IAU Office of Astrononomy for Education (OAE) - astro4edu.org. 2020–2026. Retrieved 2026-01-15. ↩

  3. “Glossary term: Dwarf Star”. IAU Office of Astrononomy for Education (OAE) - astro4edu.org. 2020–2026. Retrieved 2026-01-15. ↩

  4. SIMBAD, entries on Regulus, Algol A and Acrux accessed on June 19, 2007. ↩

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