Concept information
Preferred term
OB associations
Definition
- A loosely bound grouping of O and B stars that typically stretches up to several hundred light-years and may contain between a dozen and several hundred O stars and B stars. The members of an OB association are young and of roughly the same age. OB associations dissipate in a few tens of millions of years. (en)
Broader concept
- Stellar associations (en)
URI
http://astrothesaurus.org/uat/1140
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