Unit 11 Homework (9)

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Astronomy

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Oct 30, 2023

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1. Explain clearly why the changes in a star's core as it leaves the main sequence cause the star to increase in radius and become a red giant. 2. Explain why an aging low-mass star forms a planetary nebula and why the nebulae shine. 3. What is a white dwarf? Why are they located in the lower left of an HR diagram? 4. How is the core of an evolved high-mass star different than the core of an evolved low mass star? How are their evolutionary tracks on the HR diagram different 5. Explain what happens in the last few days of a high-mass star's evolution that causes a core-collapse supernova. 6. Briefly describe how a Type I supernova happens. Why do these happen only in binary star systems? 7. Why are supernova explosions important for life on Earth? 8. How do astronomers use stellar evolution and the H-R diagram to measure the age of star clusters?
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