exam2 - Astro 346, Spring Semester 2004 Second intermediate...

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Astro 346, Spring Semester 2004 Second intermediate exam Problem 1: Nuclear fusion Use your own words to answer the following questions. Explain your answers. Why does helium burning occur only during the later stages of stellar evolution? How does the power yield of helium burning compare with that of hydrogen burning, if both proceed at the same rate? What are the processes that lead to the iron catastrophy? Problem 2: Red giants Suppose the time-averaged luminosity of a 1 M ± star after it leaves the main sequence to be 20 L ± . Suppose further that in ascending to the giant branch the helium core increases by 0.3 M ± . How long does it take such a star to ascend to the tip of the red-giant branch? Express your answer is billions of years. What ratio of red-giant stars to main-sequence stars is to be expected for 1 M ± stars? What would their relative contributions be to the total light of a galaxy? Problem 3: Binary stars
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This note was uploaded on 02/29/2012 for the course PHYS 227 taught by Professor Rabe during the Fall '08 term at Rutgers.

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exam2 - Astro 346, Spring Semester 2004 Second intermediate...

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