1. Lab 9 – Ages and Distances to Clusters

2. Stars in a Cluster Common Properties Distance Age Chemical composition
Different Properties
Spectral Types (temperature)
Luminosity Class (size)
Mass

3. Reddens Light (makes stars appear cooler)
Interstellar Dust
Reddens Light (makes stars appear cooler)
Dims Light (makes stars appear further away)
Interstellar Reddening

5. NGC Young Cluster
distance - 2,600 ly age - 2 million years

6. Pleiades - Open Cluster

7. M3 - Globular Cluster
distance - 32,000 ly age - 10 billion years old

9. M45
5.7
138
0.05
0.15
5.55
129
420
-0.1
5x107

10. The End.