HW#29: pg. 514 Rev 4 – 6, CST 4 – 6
Rev 4 – 6
4. How long does it take for a star like the Sun to evolve from the main sequence to the top of the red-giant branch?
5. Do all stars eventually fuse helium in their cores?
6. What is the helium flash?
CST 4 – 6
4. When the Sun is on the red-giant branch, it will be found at the (a) upper left; (b) upper right; (c) lower right; (d) lower left of the H-R diagram.
5. After the core of a Sun-like star starts to fuse helium on the horizontal branch, the core becomes (a) hotter; (b) cooler; (c) larger; (d) dimmer with time.
6. If the evolutionary track in Overlay 3, showing a Sun-like star, were instead illustrating a significantly more massive star, its starting point (stage 7) would be (a) up and to the right; (b) down and to the left; (c) up and to the left; (d) down and to the right.