Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 17, Problem 73Q
To determine
The role of Doppler shift in analyzing spectroscopic binaries.
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Chapter 17 Solutions
Universe
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- Why do most known visual binaries have relatively long periods and most spectroscopic binaries have relatively short periods?arrow_forwardAppendix J lists the stars that appear brightest in our sky. Are most of these hotter or cooler than the Sun? Can you suggest a reason for the difference between this answer and the answer to the previous question? (Hint: Look at the luminosities.) Is there any tendency for a correlation between temperature and luminosity? Are there exceptions to the correlation?arrow_forwardWhat is the parallax angle of a star that is 50 pc away? enter your answer in arc secondsarrow_forward
- What causes reddening of starlight? Explain how the reddish color of the Sun’s disk at sunset is caused by the same process.arrow_forwardThere are fewer eclipsing binaries than spectroscopic binaries. Explain why. Which is the hottest? Coolest? Most luminous? Least luminous? In each case, give your reasoning.arrow_forwardEstimating the luminosity class of an M star is much more important than measuring it for an O star if you are determining the distance to that star. Why is that the case?arrow_forward
- Which is easier to observe at large distances-a spectroscopic binary or a visual binary?arrow_forwardA star is often described as “moving” on an HR diagram; why is this description used and what is actually happening with the star?arrow_forwardExplain how an HR diagram of the stars in a cluster can be used to determine the age of the cluster.arrow_forward
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