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Star Clusters

Star Clusters. Pre clusters. Courtesy University of Oregon. Types. Associations Ironically, a dis associating 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

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Star Clusters

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  1. Star Clusters

  2. Pre clusters Courtesy University of Oregon

  3. 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

  4. Double Cluster

  5. 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

  6. Newly found clusters in NGC 6397 (left) 1BLY; M15 (right)

  7. Beehive Open Cluster

  8. M80, one of the densest of the 147 known globular star clusters in the Milky Way; 28,000 LY

  9. 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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