Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 17, Problem 66Q
To determine
The difference between white and brown dwarfs.
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Why are red dwarfs very dim.
Question.
Consider a spherical giant molecular cloud, of mass 2e30 kg and radius 3.09e16 m. What is the
shortest possible rotation period for this cloud (in years)?
Answer.
3.48e4
1.96e2
9.37e7
7.28e6
Match the spectral type and luminosity class to theletters shown on the Hertzsprung-Russell diagram
1) A WD (White Dwarf)2) G V (Main Sequence) 3) M V (Main Sequence)4) M I (Supergiant)5) G III (Giant)
Chapter 17 Solutions
Universe: Stars And Galaxies
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- Why do you think astronomers have suggested three different spectral types (L, T, and Y) for the brown dwarfs instead of M? Why was one not enough?arrow_forwardWould you expect to find any white dwarfs in the Orion Nebula? (See The Birth of Stars and the Discovery of Planets outside the Solar System to remind yourself of its characteristics.) Why or why not?arrow_forwardSuppose you want to search for brown dwarfs using a space telescope. Will you design your telescope to detect light in the ultraviolet or the infrared part of the spectrum? Why?arrow_forward
- How do the two types of supernovae discussed in this chapter differ? What kind of star gives rise to each type?arrow_forwardApproximately 6000 stars are bright enough to be seen without a telescope. Are any of these white dwarfs? Use the information given in this chapter to explain your reasoning.arrow_forwardHow does a white dwarf differ from a neutron star? How does each form? What keeps each from collapsing under its own weight?arrow_forward
- Why don't red dwarfs become giant stars?arrow_forwardIndicate whether the following statements are true or false. (Select T-True, F-False. If the first is T and the rest F, enter TFFFFF). A) White dwarfs are small dense objects about the size of the Earth. B) White dwarfs are composed mostly of hydrogen. C) A planetary nebula forms when a star violently explodes. D) A planetary nebula is the remnant of the outer envelope of a star. E) A white dwarf is the remnant of the star's core visible after the outer layers have been ejected.arrow_forwardWhat happens to a White Dwarf's radius if a little mass is added? What happens if a companion star dumps matter on top of a white dwarf and raises the mass to 1.4 times the mass of the Sun?arrow_forward
- The next generation of stars that form from clouds containing material from stars that have undergone supernova explosions will be ______________________ than the present generation of stars. a. bigger b. smaller c. hotter d. more metal rich e. more metal poorarrow_forwardWhat is the size of a typical white dwarf? Group of answer choices 1.0 solar radii 0.5 solar radii 0.1 solar radii (roughly the size of Jupiter) 0.01 solar radii (roughly the size of Earth) 5 solar radiiarrow_forwardWhen a mass is transferred through the inner Lagrangian point in a binary system toward a white dwarf, the material forms a rapidly growing whirlpool of material known as a(n) a. accretion disk. b. Lagrangian point. c. Algol paradox. d. planetary nebula. e. supernova remnant.arrow_forward
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