Stellar Associations Flashcards
A loosely bound group of very young stars.
1
Q
OB Associations
A
These contain very luminous O- and B-type main-sequence, giant, and super-giant stars.
2
Q
B Associations
A
These contain only B-type main-sequence and giant stars but with an absence of O-type stars. These associations are just older versions of the OB association, and thus the faster-evolving O-type stars have been lost to the group as supernovae.
3
Q
T Associations
A
These are groupings of T Tauri-type stars. They are irregular variable stars that are still contracting and evolving toward being A-, F- and G-type main-sequence stars. More often than not they will be shrouded in dark dust clouds, and those that are visible will be embedded in small reflection and emission nebulae.
