1. Digital Demo Room Stellar Structure and Evolution
By Jake Simon and Charles Hansen
Supervised by Professor Charles Gammie and Graduate Student Eric Engelhard
The DDR-SSE Website

2. Overview Purpose Hertzsprung-Russell diagrams Movie format
Stellar evolution
Initial mass function

3. Purpose Visualize stellar evolution Education
Animated Hertzsprung-Russell diagram
Accurate physics
Education
To use in classrooms
Customizable from web
Different complexity levels for different education levels

4. Hertzsprung-Russell Diagrams
Luminosity vs. surface temperature
Main sequence (blue)
Red giant and supergiant (red)
White dwarf (white) or neutron star (shaded) or black hole
Log(L)
Log(T)
HR Diagram with star types indicated

5. Movie Format Animated HR diagrams Limits of graph Star color
Surface temperature: 10^(2.9) – 10^(4.9) K
Luminosity: 10^(-5) – 10^(6.2) Lo
Star color
Single star
Radius
Rotation

6. Life of Stars Main sequence Hertzsprung gap or subgiant branch
Horizontal branch
Asymptotic giant branch

7. Death of Stars Planetary Nebulae (mass < 8 Mo)
Helium white dwarfs
Carbon/Oxygen white dwarfs
Supernovae (mass > 8 Mo)
Neutron stars
Black holes

8. Initial Mass Function

9. Summary Educational simulation Animated HR diagram
Surface temperature, luminosity, radius, rotation
Visualizes stages of stellar evolution

10. Questions or Comments?
Contact Information
Charles Hansen –
Jake Simon –
Professor Gammie – 235 LLP