4
Globular
vs. open clusters
•Open
Clusters
–Typically
a few thousand stars
–Not
gravitationally bound
–Often
contain young stars
–Concentrated
in plane of Milky Way
–Distributed
“randomly” around the circle of the Milky Way
•Globular
Clusters
–Typically
>hundred thousand stars
–Only
contain older stars
–Are
gravitationally bound
–Not
strongly concentrated in plane of Milky Way
–Not
randomly distributed around the circle of the Milky Way – more towards Sagittarius
