Foundations of Astronomy (MindTap Course List)
Foundations of Astronomy (MindTap Course List)
14th Edition
ISBN: 9781337399920
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Chapter 9, Problem 7P
To determine

The spectral type and temperature.

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1. The relative velocities of four stars are shown in the figure below with arrows. If an astronomer were to study the light from these four stars, in which star would the astronomer see greatest redshift of its light spectra? Hint: Think Doppler Effect A. star 1B. star 2C. star 3D. star 4
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.
The spectral type of a star is directly related to its color. Recall that a star emits light as a blackbody, which has a particular shape to its spectrum, as shown in this figure. Based on this, what basic property of a star determines its color (and thus its spectral type)? Choose one: A.  age B.  composition C.  radius D.  temperature
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