21st Century Astronomy
21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 13, Problem 9QP
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The hydrogen lines in spectral type A stars   a. are most narrow for supergiants.   b. are most narrow for main-sequence stars.   c. cannot be used to estimate the luminosity of the star.   d. are very weak and difficult to see.   e. are useful in determining the apparent magnitude of the star.
The total mass of a binary system can be calculated from   a. the ratio of the angular separation from the center of mass of each of the stars.   b. the distance to the binary and its radial velocity.   c. the semi major axis and period of the orbit.   d. the radial velocities of the two stars.   e. the time required for the small star to eclipse the larger star.
Which of the following WOULD NOT characterizes the type(s) of star we would find at g, m, n, o, and p on the Hertzsprung-Russel Diagram (Figure 4) a. are all smaller than q,i,h. b. fuse hydrogen into helium. c. are called, “the main sequence”. d. fuse He into heavier elements. e. get smaller towards the right side
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