1 / 38

Open Clusters

Open Clusters. Allan Harrell Edgar Toledo Tenaya Pusley Carmen De Martis. What is a star?. A giant ball of gas Hydrogen Emits light Different colors and sizes. How do stars form?. Form from clouds of dust and molecular hydrogen Gravity collapse. Why doesn’t a star continue collapsing?.

zytka
Download Presentation

Open Clusters

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Open Clusters Allan Harrell Edgar Toledo Tenaya Pusley Carmen De Martis

  2. What is a star? • A giant ball of gas • Hydrogen • Emits light • Different colors and sizes

  3. How do stars form? • Form from clouds of dust and molecular hydrogen • Gravity collapse

  4. Why doesn’t a star continue collapsing? • Hydrostatic Equilibrium • Gravity pushes in…. • Pressure pushes out… • Create an equilibrium

  5. What are open clusters? • Young stars • Same chemical composition • Same Age • Distance • Bound by gravity • Form in spiral and irregular galaxies

  6. The Main Sequence

  7. About Main Sequence Stars • Stars spend most of their life in the main sequence, about 90% • Our sun is 5 billion years into its main sequence • The larger the star, the less time it will spend on the main sequence • Main sequence stars maintain brightness and energy through fusion

  8. Photosphere

  10. Fusion is important!! Fusion creates energy Energy raises temperature Temperature makes atoms move faster Faster moving atoms increase pressure Pressure fights against gravity

  11. http://www.star.ucl.ac.uk/groups/hotstar/images/life_cycle.jpghttp://www.star.ucl.ac.uk/groups/hotstar/images/life_cycle.jpg

  12. “What happens in a high mass star?” • Shorter lifetimes • Consumes fuel faster • Fuses more elements. • Fusion of iron consumes energy instead of giving off energy.

  13. Fuel fusion http://physics.uoregon.edu/~jimbrau/BrauImNew/Chap21/FG21_05.jpg

  14. “Supernova explosion” http://imgsrc.hubblesite.org/hu/db/2004/29/videos/d/stills/3/image.jpg

  15. “What happens after death” It either becomes a: Black hole or a Neutron star.

  16. http://dante.physics.montana.edu/ns_interior.jpg

  17. “Black Hole” http://www.wvp-consulting.com/astronomy/images/blackhole.jpg

  18. Observations: Used the Lick Nickel 40 inch telescope Observed remotely with the help of Elinor Gates Took images of 4 open clusters http://www.ucolick.org/graphics/nickel_lg.jpg

  19. CCDs: • Basic tools of astronomical imaging • Grids of light buckets • Colorblind • 3 different filters allow us to see color (red, green, and blue) • Same as the digital cameras that you may own

  20. Isochrones: • “Freeze frame” of a cluster • Reveals age of cluster • Made by computer Y=brightness X=color and temp.

  21. Which Isochrone Matches the CMD? A. B. This one! Correct! :)

  22. (CMD) (ISOCHRONE)

  23. How to calculate the distance: d=100.2 ( m-M+5-Ar ) Due to dust Apparent Mag. (from CMD) Absolute Mag. Distance (from isochrone)

  24. M11, The Wild Duck Cluster i hh

  25. M11

  26. Color Magnitude Diagram • y-axis = brightness • x-axis = color M11 • Around 2000 parsecs • Around 6000 light years • Mostly main sequence stars • 200 million years old

  27. NGC6939 • What I found out : • 5095 light years from the earth • 1.6 billion years old

  28. My Color Magnitude Diagram

  29. Open Cluster NGC6939

  30. NGC 6819Apparent Diameter: 5 arc min.

  31. “NGC 6819”Open star cluster According to my results: -It is about 3/4 of the Earth’s lifetime old. -It is about 7,603 light years away from us. -Has a metallicity of about 2%---like Sun

  32. “Isochrone” “CMD” for NGC 6819

  33. NGC 6791 • Observed and recorded data for NGC 6791 • 7.6 billion years old • Looking at isochrones • 4972 parsecs (3.26 light years = 1 parsec)

  34. Isochrones

  35. Puzzles from NGC 6791 • It’s really old • Metal rich

  36. NGC 6705 NGC 6791 NGC 6819 Sun NGC 6939

  37. We would like to thank: • John Martin • Hilary O’Bryan • Jay Strader • Gene Switkes • Vay Hoang CFAO Laura Chomiuk Kathy Cooksey Daisy Corral Liz Espinoza Emily Freeland Elinor Gate

More Related