Digital Demo Room Stellar Structure and Evolution By

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 http: //rainman. physics. uiuc. edu/ddr/stellar

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

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

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

Movie Format • Animated HR diagrams • Limits of graph – Surface temperature: 10^(2. 9) – 10^(4. 9) K – Luminosity: 10^(-5) – 10^(6. 2) Lo • Star color • Single star – Radius – Rotation

Life of Stars • • • Main sequence Hertzsprung gap or subgiant branch Giant branch Horizontal branch Asymptotic giant branch

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

Initial Mass Function

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

Questions or Comments? Contact Information Charles Hansen – chansen@uiuc. edu Jake Simon – jbsimon@uiuc. edu Professor Gammie – 235 LLP