Association

Definition

An association is a group of stars that share a common origin and are gravitationally bound for a relatively short period of time. They are less concentrated than star clusters and often disperse after several million years.

5 Must Know Facts For Your Next Test

1. Associations typically contain young, massive stars.
2. They can be found in regions of active star formation.
3. OB associations are the most well-known type, consisting mainly of O and B-type stars.
4. The stars in an association move together through space, forming a loose grouping.
5. Associations play a crucial role in understanding the early stages of stellar evolution.

Review Questions

• What type of stars are commonly found in OB associations?
• How long do associations typically remain gravitationally bound?
• In what regions are associations most commonly found?

Related terms

Star Cluster: A group of stars that are gravitationally bound and formed from the same molecular cloud.

Stellar Evolution:

The process by which a star changes over the course of time.

Main Sequence Star:

A star that is in the longest-lasting stage of its lifecycle, where it fuses hydrogen into helium.