Study Guide for Exam 3

Study Guide for Exam 3 - Study Guide for Exam 3 Chapter 12...

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Study Guide for Exam 3 Chapter 12 A- Which two processes generate energy to help a star maintain its internal thermal pressure? Nuclear fusion and gravitational contraction B- Our Sun is considered to be a _________. Low Mass Star- stars with less than about 2 times the mass of our Sun are considered low-mass stars. C- Angular momentum plays an important role in star formation. Which of the following characteristics of a protostellar system is probably NOT strongly affected by the star'''s angular momentum? The Onset of core hydrogen fusion-burning is mainly affected by a protostar’s mass D-Which process is required to allow a gravitationally-collapsing gas cloud to continue to collapse? The cloud must radiate much of its thermal energy. E-If the laws of quantum physics changed such that degeneracy pressure became important at a lower density, how would that affect the minimum mass of a star? The minimum mass would be higher than 0.08 solar masses. F-Generally speaking, how does the surface temperature and luminosity of a protostar compare to the surface temperature and luminosity of the main-sequence star it becomes? A main-sequence star is hotter and dimmer than it was as a protostar. G-Consider a large molecular cloud that will give birth to a cluster of stars. Which of the following would you expect to be true? A few massive stars will form, live, and die before the majority of the star’s clusters even complete their protostar stage. H-We do not know for certain whether the general trends we observe in stellar birth masses also apply to brown dwarfs. But if they do, then which of the following would be true? Brown dwarfs would outnumber all ordinary stars. Less massive stars are more common than more massive stars, so if this trend continues then the very low mass brown dwarfs would be more common than any type of main-sequence star. I-Where would a brown dwarf be located on an H-R diagram?
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It would be located below and to the right of the lowest part of the main sequence. They are dimmer and cooler than the smallest main-sequence stars. J-Which of the following types of data provide evidence that helps us understand the life tracks of low-mass stars? H-R diagram of a globular cluster -a globular cluster is comprised of stars that formed at about the same time, and the globular clusters in the Milky Way are full of old low-mass stars in various stages of evolution. K- This diagram represents the life track of a 1 solar mass star. Refer to the life stages labeled with roman numerals. During which stage is the star's energy supplied by primarily by gravitational contraction? -ii L- This diagram represents the life track of a 1 solar mass star. Refer to the life stages labeled with roman numerals. During which stage does the star have an inert (non-burning)
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This note was uploaded on 04/03/2008 for the course ISP 205 taught by Professor Donahue during the Fall '08 term at Michigan State University.

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Study Guide for Exam 3 - Study Guide for Exam 3 Chapter 12...

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