Fr.: association stellaire
1) A large, loose grouping of 10 to 1000 stars that are of similar spectral type and
share a common origin. The members move together
through space, but have become gravitationally → unbound.
Stellar associations are primarily identified by their common
movement vectors and ages.
→ OB association;
→ T association;
→ R association.
The concept of stellar association was first introduced by Viktor A. Ambartsumian (1908-1996), Armenian astrophysicist (1947, Stellar Evolution and Astrophysics, Armenian Acad. of Sci.; German translation, Abhandl. Sowjetischen Astron. Ser. 1. 33, 1951). → stellar; → association.