The OCStarring:

M11 and NGC 6819

Jared Rosen, Becca Gallery, and Molly Zimmerman

• 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

Open Clusters

NASA/ESA/AURA/Caltech.

Color and Temperature

Stellar Evolution

• Star formation

• Main sequence

• Red giants

Star Formation

Main Sequence

Hot cold

Bright

• Where stars spend most of lifetime

• Hydrogen burning

•Our sun is on the main sequence

• Massive stars have shorter lifetimes

• Massive stars are bright and hot

dim

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

+ +

=

= Color

ma

gn

itude

redblue

Main sequence

Red Giant Branch

= Colorblue red

ma

gn

itude

Main sequence

Red Giant Branch

Red clump

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• 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

COSMOS