OB star


OB stars are hot, massive stars of spectral types O or early-type B that form in loosely organized groups called OB associations. They are short lived, and thus do not move very far from where they formed within their life. During their lifetime, they will emit much ultraviolet radiation. This radiation rapidly ionizes the surrounding interstellar gas of the giant molecular cloud, forming an H II region or Strömgren sphere.

LH 72 is one of the OB associations present in the Large Magellanic Cloud.

In lists of spectra the "spectrum of OB" refers to "unknown, but belonging to an OB association so thus of early type".[dubious ]

See alsoEdit


  • M. Pantaleoni González (2021). "The Alma catalogue of OB stars - II. A cross-match with Gaia DR2 and an updated map of the solar neighbourhood". Monthly Notices of the Royal Astronomical Society. 661 (2): 2968–2982. Bibcode:2021MNRAS.504.2968P. doi:10.1093/mnras/stab688.

External linksEdit

  • Bouy, Hervé and Alves, João: Cosmography of OB Stars in the Solar Neighborhood Astronomy & Astrophysics (December 2015). A three-dimensional map of OB star density within 500 pc of the Sun.
  • [1] — Scientia Astrophysical Organization's star classification page
  • Philippe Stee's homepage: Hot and Active Stars Research