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by Amanda Loo & Catherine Russell

COSMOS 2005 Cluster 7 Presents:. Globular Clusters. by Amanda Loo & Catherine Russell. Outline. What is a globular cluster? How do stars evolve? Observing Filters, tri-color image Age of and Distance to M13 Age of the Universe. What is a globular cluster?. A globular cluster is a…

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by Amanda Loo & Catherine Russell

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  1. COSMOS 2005 Cluster 7 Presents: Globular Clusters by Amanda Loo & Catherine Russell

  2. Outline • What is a globular cluster? • How do stars evolve? • Observing • Filters, tri-color image • Age of and Distance to M13 • Age of the Universe

  3. What is a globular cluster? A globular cluster is a… • very dense • extremely old • super bright • gravitationally bound • populated (millions of stars) collection of stars found in the halo of our galaxy.

  4. Hertzsprung-Russell Diagrams Bright Luminosity SUN Temperature Dim Hot Cold

  5. Asymptotic Giant Branch Helium Flash Red Giant Branch The Giants HorizontalBranch Evolution of a 1 Solar Mass Star

  6. Observing • M13 and M5 • Nickel 40 Inch Reflector Telescope at Lick Observatory on Mt. Hamilton • Remote observing through video conference with Ellie Gates • Digital detector called a charge coupled device (CCD) • CCDs can detect photons but not color so we used filters to detect photons of different wavelengths.

  7. RGBs

  8. Color Magnitude Diagrams • Specialized H-R Diagram • Converts luminosity to apparent • magnitude (how bright it looks) • Converts temperature to color • (like heating a stove) Bright Helium Flash Bright Red Giant Branch Magnitude Horizontal Branch Luminosity Turnoff from Main Sequence Dim Dim Hot Cold Temperature Bluer Color Redder

  9. Yale Isochrones

  10. Isochrones • Used to find age and distance • Difficult to use • Horizontal Branch not modeled

  11. Conclusions • By fitting isochrones, we determined M13 to be 19 billion years old! • Literature says 14 billion- the same age as the universe. • We also determined M13 to be between 4-10 thousand light years away. • Literature says about 24,000 light years.

  12. Thanks to: • Kirsten Howley • Andrea Michels • Becca, Molly, Jared • open clusters group • Ellie Gates • Hilary & Greg O’Bryan • supplying teenagers with liquid nitrogen • Jason Porter • John Martin • Kathy Cooksey • Laura Chomiuk • Malika Mountawakkil-Bell • Monica Piñon • for powerpoint tips • Nick Konidaris & Jay Strader • balloon blower uppers & computer donor • CfAO • COSMOS

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