Weeks 9-11 Learning Objectives

Weeks 9-11 Learning Objectives - Learning Objectives Weeks...

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Learning Objectives Weeks 9-11 . 1. Know that star birth can begin in giant molecular clouds. Know that protostars form in cold, dark nebulae. In the first stage of star formation, a protostar coalesces and contracts due to the mutual gravitational attraction of its parts. Know what a T-Tauri star is. 2. Know that protostars evolve into main-sequence stars and that the course of a protostar’s evolution depends on its mass. Know what defines a main sequence star. 3. Know how the H-R diagram can reveal the age of a star cluster. 4. When core hydrogen fusion ceases, a main-sequence star like the Sun becomes a red giant. In the transition from main-sequence star to red giant, the star’s core contracts while its outer layers expand. Know the difference in evolution between a sun-like star and a red dwarf star. 5. Fusion of helium into carbon and oxygen begins at the center of a red giant. 6. Know the difference between population I and II stars. 7. Know the significance of Cepheid variables. 8. Know how mass transfer can affect the evolution of close binary star systems. If the stars in a binary system are sufficiently close, tidal forces can pull gases off one star and onto the other. 9. Know that stars of moderately low mass die by gently ejecting their outer layers, creating planetary
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Weeks 9-11 Learning Objectives - Learning Objectives Weeks...

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