Lecture 12

Lecture 12 - 1 Globular Clusters o Old clusters 2 The Globular Cluster H-R Diagram o Main sequence white background o Red giants appear

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1. Globular Clusters o Old clusters 2. The Globular Cluster H-R Diagram o Main sequence- white background o Red giants- appear white/orange 3. Class Vote Question o Which type of cluster should have the highest abundance of heavy elements? Open cluster (young, recently formed) Formed in a universe that was more contaminated with heavy metals from nuclear processing Globular cluster (old, formed long ago) Formed from clouds that were made of mostly hydrogen and helium 4. The other difference between open and globular clusters o Typical gas in the local universe is 74% hydrogen 25% helium 1% metals o Universe began with just hydrogen and helium, no metals Formed by fusion in stars Old stars have less metals- Lower Metallicity This is why globular clusters have a lower abundance of heavy metals o Population I Stars Young, open clusters, lots of metals o Population II Stars Globular, low metallicity o Population III Stars
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This note was uploaded on 03/30/2012 for the course ASTR 1102 taught by Professor Staff during the Spring '08 term at LSU.

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Lecture 12 - 1 Globular Clusters o Old clusters 2 The Globular Cluster H-R Diagram o Main sequence white background o Red giants appear

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