The Cosmic Perspective (9th Edition)
9th Edition
ISBN: 9780134874364
Author: Jeffrey O. Bennett, Megan O. Donahue, Nicholas Schneider, Mark Voit
Publisher: PEARSON
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Chapter 18, Problem 46EAP
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To explain: The scenario of you being a member of a binary system that is a white dwarf in a close binary system.
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Based on what you learned about stellar evolution, select all of the correct statements from the following list.
1. The period of some Cepheid variables actually changes.
2. When getting dimmer, variable stars are releasing energy; when getting brighter they are storing energy.
3. variable stars are expanding and contracting
4. despite their variability, variable stars stay in a specific position on the H-R diagram.
5. A changing period in a Cepheid variable means that the size of the star is changing and that the star is therefore evolving.
6. Only stars on the instability strip are variable.
7. More massive stars will vary their brightness more quickly.
True or False
8. Almost all stars are in binary systems. The book says: "So far you have been considering the deaths of stars as if they were all single objects that never interact, but more than half of all stars are members of binary star systems."From this, I would not necessarily say that almost all stars are in binary systems based on this alone, but some other information I am finding says up to 85%. However, the numbers seem to be all over the map outside the course material, and I can not find a solid figure in it from what I have looked at.
If it helps, Stars and Galaxies, 10th Edition by Seeds and Beckman is my reference material.
Based on what you learned about the source of stellar energy and how stars make energy, select all of the correct statements from the following list.
1. Many stars make energy with the proton-proton cycle.
2. The CNO cycle is more efficient than the proton-proton cycle.
3. The sun's energy comes from the CNO cycle.More massive stars make energy with the proton-proton cycle.
4. The leftover mass in both the proton-proton cycle and the CNO cycle is converted to energy.
5. A helium atom is more massive than four hydrogen atoms.
6. The CNO cycle requires a higher temperature than the proton-proton cycle.
Chapter 18 Solutions
The Cosmic Perspective (9th Edition)
Ch. 18 - Prob. 1VSCCh. 18 - Prob. 2VSCCh. 18 - Prob. 3VSCCh. 18 - Prob. 4VSCCh. 18 - Prob. 5VSCCh. 18 - Prob. 1EAPCh. 18 - Prob. 2EAPCh. 18 - Prob. 3EAPCh. 18 - Prob. 4EAPCh. 18 - Prob. 5EAP
Ch. 18 - Prob. 6EAPCh. 18 - Prob. 7EAPCh. 18 - Prob. 8EAPCh. 18 - Prob. 9EAPCh. 18 - 10. In what sense is a black hole like a hole in...Ch. 18 - Il. What do we mean by the singularity of a black...Ch. 18 - Prob. 12EAPCh. 18 - Prob. 13EAPCh. 18 - Prob. 14EAPCh. 18 - Prob. 15EAPCh. 18 - Prob. 16EAPCh. 18 - Prob. 18EAPCh. 18 - Prob. 19EAPCh. 18 - Decide whether tile statement makes sense (or is...Ch. 18 - Prob. 21EAPCh. 18 - Decide whether tile statement makes sense (or is...Ch. 18 - Prob. 23EAPCh. 18 - Prob. 24EAPCh. 18 - Decide whether tile statement makes sense (or is...Ch. 18 - Decide whether tile statement makes sense (or is...Ch. 18 - Prob. 27EAPCh. 18 - Choose the best answer lo each of the following....Ch. 18 - Prob. 29EAPCh. 18 - Choose the best answer lo each of the following....Ch. 18 - Prob. 31EAPCh. 18 - Prob. 32EAPCh. 18 - Prob. 33EAPCh. 18 - Prob. 34EAPCh. 18 - Prob. 35EAPCh. 18 - Prob. 36EAPCh. 18 - Black Holes in Popular Culture. Expressions such...Ch. 18 - Prob. 39EAPCh. 18 - Prob. 41EAPCh. 18 - Prob. 42EAPCh. 18 - Prob. 43EAPCh. 18 - Prob. 44EAPCh. 18 - Prob. 45EAPCh. 18 - Prob. 46EAPCh. 18 - Prob. 47EAPCh. 18 - Prob. 48EAPCh. 18 - Why Black Holes Are Safe. Explain why the...Ch. 18 - Surviving the Plunge. The tidal forces near a...Ch. 18 - Prob. 52EAPCh. 18 - Prob. 53EAPCh. 18 - Prob. 54EAPCh. 18 - Prob. 55EAPCh. 18 - Prob. 56EAPCh. 18 - Prob. 57EAPCh. 18 - Prob. 58EAPCh. 18 - Prob. 59EAPCh. 18 - Prob. 60EAPCh. 18 - Prob. 61EAP
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- Which of the following types of data provide evidence that helps us understand the various stages of the life tracks of low-mass stars? A. H-R diagrams of open clusters B. spacecraft observations of the Sun C. observing a low-mass star over many years D. H-R diagrams of globular clustersarrow_forwardWhich of the following most correctly explains why we have not yet observed any white dwarfs derived from M stars: Group of answer choices Most M stars end up as neutron stars or black holes. The lifetime of M stars is longer than the age of the universe. Most M stars are located near the edge of the universe, beyond the visible horizon. Most M stars are members of a binary system, and the white dwarf would be obscured by the glare of the more massive companion. White dwarfs are too dim to be observed with currently available techniques.arrow_forwardChoose the correct statements from the following list referring to white dwarfs. (Give ALL correct answers, i.e. B, AB, BCD...) A) Stars with a mass like the Sun will end up as a white dwarf star. B) White dwarfs with mass greater than 1.4 times the Sun's mass cannot exist. C) White dwarfs are less dense than red giants. D) The pressure that balances gravity in a white dwarf is called degenerate electron pressure. E) White dwarfs cool slowly because they are small and eventually fade-out to become black dwarfs. F) The power source of white dwarfs is left-over heat. G) White dwarfs are the coolest main sequence stars.arrow_forward
- Using a Hertzsprung–Russell diagram to illustrate your answer, describe in detail the followingmain stages of a solar mass star’s evolutionary track. You should briefly describe the importantphysical process/processes at each stage, and one or two observational facts.• protostar• main-sequence• post-main-sequencearrow_forwardTopic: Life Cycle of Stars Q. Explain what changes occur in the temperature and size of a Sun-sized star as it goes through its life cycle? Pls answer in 2-3 sentences. Thank You!arrow_forwardChoose the correct statements from the following list referring to white dwarfs. (Give ALL correct answers, i.e., B, AC, BCD...) A) The pressure that balances gravity in a white dwarf is called degenerate electron pressure. B) The power source of white dwarfs is left-over heat. C) White dwarfs cool slowly because they are small and eventually fade-out to become black dwarfs. D) White dwarfs with mass greater than 1.4 times the Sun's mass cannot exist. E) Stars with a mass like the Sun will end up as a white dwarf star. F) White dwarfs are less dense than red giants. G) White dwarfs are the coolest main sequence stars.arrow_forward
- All massive main sequence stars reside in clouds of glowing gas. The four powerful stars in the center of the Orion Nebula are good examples. Lower mass stars like the Sun generally don't have clouds of gas around them. a. Why do powerful stars reside in gas clouds? b. What is making the gas glow exactly? For the last question, refer to the surface temperature of these stars, and to Wien's Law.arrow_forwardWhat kind of star is most likely to become a white-dwarf supernova? A. a star like our Sun B. a white dwarf star with a red giant binary companion C. a pulsar D. an O star Is the answer B? For D, as the surface temperature of a star would change over time so spectral type cannot tell us about the fate of the stars?arrow_forwardFor each statement concerning main sequence stars, select T True, F False, G Greater than, L Less than, or E Equal to. A) The surface temperature of a O type star is .... than a K type star. B) On the main sequence, the mass of a O type star is .... than a F type star. C) On the main sequence, a M type star's life is .... than a G type star. D) The surface temperature of our Sun is .... than the surface temperature of Sirius. E) When stars start hydrogen burning, thier mass determines where they are on the main sequence. F) Based on the relative lifes of M and G type stars we expect the number of M stars to be .... than the number of G type stars.arrow_forward
- White Dwarf Density. If a star the size of the Sun collapses to form a white dwarf the size of Venus, by what factor will its density increase? (Hints: The volume of a sphere is Tp3. The radii of the Sun and Venus are 6.96x105 3 km and 6050 km, respectively.) Please round your answer to two significant digits. Pina! Pinitialarrow_forwardYou discover a binary star system in which one member is a 15 solar-mass main-sequence star and the other star is a 10 solar-mass giant. Why should you be surprised, at least at first? A. It doesn't make sense to find a giant in a binary star system. B. The two stars in a binary system should both be at the same point in stellar evolution; that is, they should either both be main-sequence stars or both be giants. C. The two stars should be the same age, so the more massive one should have become a giant first. D. The odds of ever finding two such massive stars in the same binary system are so small as to make it inconceivable that such a system could be discovered. E. A star with a mass of 15 solar-mass is too big to be a main-sequence star.arrow_forwardAstronomy again. Estimate the luminosity of a 3-solar-mass main-sequence star; of a 9-solar-mass main-sequence star. Can you easily estimate the luminosity of a 3-solar-mass red giant star? Why or why not?arrow_forward
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