astro hw 7 - Chapter 19 1 4 Because of their higher...

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Chapter 19 1. 4. Because of their higher luminosity, higher-mass main sequence stars lose mass and die more quickly when compared to lower-mass stars. 9. Within a Helium nucleus are two protons. Because their both positive charges, the two protons repel each other, requiring more energy to balance the force. 10. Temperature does not affect degenerate pressure. 2. 13. When a star is referred to as moving, it means it has advanced to the next stage in its life. 16. A starts age is equal to its turn-off point because at a stars’ turn-off point, the hydrogen within the cores begin exhausting. 17. Main-sequence stars of spectral class M have not been around long to enough to evolve into red-giant stars in our universe. 18. Astronomers know that globular clusters are old because they lack high-mass main-sequence stars. Chapter 20 3. 1. The horizontal branch is the path that a star’s evolutionary track moves along. It’s located on the left of the H-R diagram, between 10,000 and 15,000 K.
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