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 15, Problem 40EAP
To determine
To Discuss: The role of modern system of stellar classification in making rapid advances in the understanding of stars.
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Choose the correct statements concerning spectral classes of stars. (Give ALL correct answers, i.e., B, AC, BCD...)
A) Neutral hydrogen lines dominate the spectrum for stars with temperatures around 10,000 K because a lot of the hydrogen is in the n=2 level.
B) Hydrogen lines are weak in type O-stars because most of it is completely ionized.
C) Oh Be A Fine Guy/Girl Kiss Me, is a mnemonic for remembering spectral classes.
D) The spectral sequence has recently been expanded to include L, T, and Y classes.
E) K-stars are dominated by lines from ionized helium because they are so hot.
F) The spectral types of stars arise primarily as a result of differences in temperature.
Choose the correct statements concerning spectral classes of stars. (Give ALL correct answers, i.e., B, AC, BCD...)
A) K-stars are dominated by lines from ionized helium because they are so hot.
B) Oh Be A Fine Guy/Girl Kiss Me, is a mnemonic for remembering spectral classes.
C) The spectral sequence has recently been expanded to include L, T, and Y classes.
D) Hydrogen lines are weak in type O-stars because most of it is completely ionized.
E) Neutral hydrogen lines dominate the spectrum for stars with temperatures around 10,000 K because a lot of the hydrogen is in the n=2 level.
F) The spectral types of stars arise primarily as a result of differences in chemical composition.
Cluster Sizes. An open cluster is a collection of 10 to 1000 stars in a region about 25 pc in diameter. About how far apart are the stars in an open cluster in units of pc? (Hints: What share of the cluster's volume belongs to a single
4
Tr. Use the cited value for the maximum number of stars in your calculation.)
star? The volume of a sphere is
pc.
Chapter 15 Solutions
The Cosmic Perspective (9th Edition)
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