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Download Open Clusters - Lick Observatory
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The OC Starring: M11 and NGC 6819 Jared Rosen, Becca Gallery, and Molly Zimmerman Open Clusters • • • • • • Young and large stars Few thousand per cluster Not as compact as globular clusters More massive stars so shorter lifetimes! All born from the same molecular cloud Stars all about same age and distance NASA/ESA/AURA/Caltech. Color and Temperature Stellar Evolution • Star formation • Main sequence • Red giants Star Formation Main Sequence Bright • Where stars spend most of lifetime • Hydrogen burning •Our sun is on the main sequence dim Hot cold • Massive stars have shorter lifetimes • Massive stars are bright and hot Red giant No fusion but gravitational contraction Red Giants! •Burning hydrogen shell •Evolved past main sequence •No hydrogen burning in core •Size expands and star brightens but temperature decreases Taking Pictures • Late night conference with Ellie (telescope operator) • M11 and NGC 6819 • Exposure times • Filters/ RGB images RGB Images + = + magnitude Red Giant Branch blue Main sequence = Color red Red clump magnitude Red Giant Branch Main sequence blue = Color red NGC 6819 vs. M11 NGC 6819 = 3 billion years old m11= 200 million years old Distances • M11 = 2600 parsecs or 8700 light years • NGC 6819 = 1400 parsecs or 4500 light years Galaxy Model Conclusion • Using CMDs and Isochrones we were able to figure out our ages, brightnesses, and distances of our open clusters • M11 = 8700 light years and 200 million years old • NGC 6819 = 4500 light years and 3 billion years old Thank you!!! • • • • • Andrea Michels Chris Martell COSMOS Ellie Gates Greg O’Bryan Globs: Catherine and Amanda • Hilary O’Bryan • Jason Porter •Jay Strader •John Martin •Kathy Cooksey •Kirsten Howley •Laura Chomiuk •Monica Piñon •Malika Moutawakkil-Bell
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