Foundations of Astronomy (MindTap Course List)
14th Edition
ISBN: 9781337399920
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Chapter 12, Problem 14P
To determine
The distance of the Delta Cephei and find the magnitude-distance of Delta Cephei.
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result, the
-1 from a
T Tauri star, estimate the mass density of the wind at a distance of 100 AU from the star. (Hint:
Refer to Example 11.2.1.) Compare your answer with the density of the giant molecular cloud
agpalain Example 12.2.1.
12.19 Assuming a mass loss rate of 10-7 Mo yr¹ and a stellar wind velocity of 80 km s
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ear
If the distance to Star C is 16 pc, what is the value of its distance modulus (m-M)?
12.1 In a certain part of the North American Nebula, the amount of interstellar extinction in the
visual wavelength band is 1.1 magnitudes. The thickness of the nebula is estimated to be
20 pc, and it is located 700 pc from Earth. Suppose that a B spectral class main-sequence star
is observed in the direction of the nebula and that the absolute visual magnitude of the star
is known to be My = -1.1 from spectroscopic data. Neglect any other sources of extinction
between the observer and the nebula.
(a) Find the apparent visual magnitude of the star if it is lying just in front of the nebula.
(b) Find the apparent visual magnitude of the star if it is lying just behind the nebula.
Problems
443
(c) Without taking the existence of the nebula into consideration, based on its apparent mag-
nitude, how far away does the star in part (b) appear to be? What would be the percentage
error in determining the distance if interstellar extinction were neglected?
Chapter 12 Solutions
Foundations of Astronomy (MindTap Course List)
Ch. 12 - Prob. 1RQCh. 12 - Prob. 2RQCh. 12 - Prob. 3RQCh. 12 - Prob. 4RQCh. 12 - Prob. 5RQCh. 12 - Describe the law of hydrostatic equilibrium.Ch. 12 - Prob. 7RQCh. 12 - Prob. 8RQCh. 12 - Prob. 9RQCh. 12 - Prob. 10RQ
Ch. 12 - Prob. 11RQCh. 12 - Prob. 12RQCh. 12 - Prob. 13RQCh. 12 - Prob. 14RQCh. 12 - Prob. 15RQCh. 12 - Prob. 16RQCh. 12 - Prob. 17RQCh. 12 - Prob. 18RQCh. 12 - Prob. 19RQCh. 12 - What gives the triple-alpha process its name? Why...Ch. 12 - Prob. 21RQCh. 12 - Prob. 22RQCh. 12 - Prob. 23RQCh. 12 - Prob. 24RQCh. 12 - Prob. 25RQCh. 12 - Prob. 26RQCh. 12 - Prob. 27RQCh. 12 - Prob. 28RQCh. 12 - Prob. 29RQCh. 12 - Prob. 30RQCh. 12 - Prob. 31RQCh. 12 - How Do We Know? How can mathematical models allow...Ch. 12 - Prob. 1PCh. 12 - Prob. 2PCh. 12 - Prob. 3PCh. 12 - Prob. 4PCh. 12 - Prob. 5PCh. 12 - Prob. 6PCh. 12 - Prob. 7PCh. 12 - Prob. 8PCh. 12 - Prob. 9PCh. 12 - Prob. 10PCh. 12 - Prob. 11PCh. 12 - Prob. 12PCh. 12 - Prob. 13PCh. 12 - Prob. 14PCh. 12 - Prob. 15PCh. 12 - Prob. 16PCh. 12 - Prob. 1SOPCh. 12 - Prob. 2SOPCh. 12 - Prob. 1LTLCh. 12 - Prob. 2LTLCh. 12 - Prob. 3LTLCh. 12 - Prob. 4LTLCh. 12 - Prob. 5LTL
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