OB association

OB association

See association.

OB association

[¦ō′bē ə‚sō·sē′ā·shən]
(astronomy)
A grouping of very young, very hot massive stars of spectral types O and B that has not had time to disperse.
References in periodicals archive ?
New research by astrophysicists from the University of Rochester focused on stars in the north part of the constellation, known as Upper Scorpius, which is a part of the Scorpius-Centaurus OB association, one of the best studied groups of young stars and a benchmark sample for investigating the early lives of stars and the evolution of their planet-spawning disks.
Propess has been adopted as the first line treatment by China OB association.
About 35 of the thousands of stars in this group, known as the Scorpius-Centaurus (Sco-Cen) OB association, weigh several times as much as the sun.