Lab 10 - Properties and Lives of Stars

For Main Sequence Stars
Main Sequence Lifetime
t∝M/L ∝1/M2.5
Star Clusters
• Groups of 100's to 1000's of stars moving
together through space
• are at the same distance, so it is easy to
measure their relative Luminosities,
• have the same age
Open Clusters
Young clusters of few 1000 stars; blue Main-Sequence stars
& few giants
Globular Clusters
Old clusters of a few 100,000 stars; no blue Main-Sequence
stars & many giants

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