Lab 9 – Ages and Distances to Clusters

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Lab 9 – Ages and Distances to Clusters

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

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

NGC 2264 - Young Cluster distance - 2,600 ly age - 2 million years

Pleiades - Open Cluster

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

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

The End.

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