A stellar association, or moving group, is a very loose
star cluster, looser than both
open clusters and
globular clusters. Stellar associations will normally contain from 10 to 100 or more stars. The stars share a common origin, but have become gravitationally unbound and are still moving together through space. Moving groups are primarily identified by their common movement vectors and ages. Identification by chemical composition is also used to factor in moving group memberships.
See more at Wikipedia.org...
A region of space in which recent star formation has led to the birth of high mass O and B type stars. There may be a couple or a couple of hundred O and B type stars in each association. The intense
ultraviolet electromagnetic radiation produced by these stars ionizes the surrounding
hydrogen and causes
emission nebulae to be produced. More importantly to the continuation of star formation, the vast
Free Download Now!
