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OB starsare hot,massive starsof spectral typesOorearly-typeBthat form in loosely organized groups calledOB 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 muchultravioletradiation. This radiation rapidlyionizesthe surroundinginterstellar gasof thegiant molecular cloud,forming anH II regionorStrömgren sphere.
In lists of spectra the "spectrum of OB" refers to "unknown, but belonging to an OB association so thus of early type".[dubious–discuss]
See also
editReferences
edit- 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.arXiv:2103.02748.Bibcode:2021MNRAS.504.2968P.doi:10.1093/mnras/stab688.
- B. Cameron Reed (2003)."Catalog Of Galactic OB Stars".The Astronomical Journal.125(5): 2531–2533.Bibcode:2003AJ....125.2531R.doi:10.1086/374771.
External links
edit- Bouy, Hervé and Alves, João:Cosmography of OB Stars in the Solar NeighborhoodAstronomy & 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
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