Stellar association

Definition

A stellar association is a loose grouping of stars that share a common origin and move together through space. These associations are less gravitationally bound than star clusters and often disperse over time.

5 Must Know Facts For Your Next Test

1. Stellar associations typically contain young stars, often less than 100 million years old.
2. They are classified into three main types: OB associations, T associations, and R associations.
3. OB associations contain massive O- and B-type stars, which are very hot and luminous.
4. T associations are rich in T Tauri stars, which are young, pre-main-sequence stars.
5. Stellar associations can be used to study the early stages of star formation and the dynamics of stellar evolution.

Review Questions

• What are the main types of stellar associations?
• Why are stellar associations important for studying star formation?
• How do stellar associations differ from more gravitationally bound star clusters?

Related terms

Star Cluster: A group of stars that are gravitationally bound and generally older than those in stellar associations.

OB Association: A type of stellar association containing massive O- and B-type stars.

T Tauri Star: A young, pre-main-sequence star found commonly in T associations.