astro.wikisort.org - 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.

This article relies largely or entirely on a single source. (June 2016)

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

• O-type main-sequence star
• B-type main-sequence star
• Stellar kinematics

References

• 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.

• 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

• 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.
• — Scientia Astrophysical Organization's star classification page
• Philippe Stee's homepage: Hot and Active Stars Research

На других языках

---

- [en] OB star

---

[es] Estrella OB

Las estrellas OB son estrellas calientes y masivas de tipo espectral O o de tipo B temprano que se forman en grupos poco organizados llamados asociaciones OB. Tienen una vida corta, por lo que no se alejan mucho del lugar donde se formaron durante su vida. Durante su vida, emiten mucha radiación ultravioleta. Esta radiación ioniza rápidamente el gas interestelar circundante de la nube molecular gigante, formando una región H II o esfera de Strömgren.

---

[ru] Звезда OB

Звёзды типа OB — это горячие и массивные голубые звёзды, относящиеся к спектральным классам O или B по диаграмме Герцшпрунга—Рассела и образующие слабо организованные группы — OB-ассоциации.

---

---