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Transcript 
Star Clusters
Pre clusters
Courtesy University of Oregon
Types
Associations


Ironically, a disassociating
open cluster
Big Dipper/Ursa Major
Open Clusters



~1000 stars
Found in the spiral arms of the
galaxy
Mostly young hot stars
Pop I
Globular Clusters



~1 million stars
Found in the galactic halo
Mostly old stars
Pop II
Double Cluster
What stellar ages tell us:
The Turnoff Point
We can know
something about the
age of a cluster of
stars by looking at
when the most
massive stars turnoff
the MS
Two animations follow
t  1010 (
M 2.9
)
M sun
Newly found clusters in NGC 6397
(left) 1BLY; M15 (right)
Beehive Open Cluster
M80, one of the densest of the 147 known globular
star clusters in the Milky Way; 28,000 LY
IR image of the Arches Cluster
About 33 pc from the
galactic nucleus
100 O class stars

Globular or Open??
Most densely packed
cluster observed
Separation ~ light
weeks apart
Not these arches ->
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