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Encyclopedia > OB star

OB stars are hot, massive stars stars which form in loosely organized groups called OB associations. They are short lived, and thus don't move very far from where they are formed. During their lifetime, they will emit copious amounts of ultraviolet radiation. This radiation rapidly ionizes the surrounding gas of the giant molecular cloud, forming an H II region. The Pleiades star cluster A star is a massive body of plasma in outer space that is currently producing or has produced energy through nuclear fusion. ... Note: Ultraviolet is also the name of a 1998 UK television miniseries about vampires. ... NGC 604, a giant H II region in the Triangulum Galaxy. ...


External links

  • [1] - Scientia Astrophysical Organization's star classification page

  Results from FactBites:
 
SCYON: Paper abstracts (853 words)
We develop a simple model for the UV output from OB star clusters as a function of the cluster mass and age in order to interpret constraints provided by the observed luminosity functions.
This implies that high mass star formation, cloud disruption due to OB stars and UV production is contributed by a large range of cluster masses with equal effects per logarithmic interval of cluster mass.
We suggest that OB star formation in a cloud core region is terminated at the point that radiation pressure on the surrounding dust exceeds the self-gravity of the core star cluster and that this is what limits the maximum mass of standard OB star clusters.
Cool Cosmos (463 words)
Infrared observations have led to the discovery of a large number of stars which are too cool to be detected by their visible light or are hidden behind obscuring dust.
This star, which is 10 million times more radiant than our Sun, was discovered in the center of our galaxy where it was hidden from visible light telescopes by thick dust.
The image to the left shows a "spiral" star which was discovered in the infrared.
  More results at FactBites »


 

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