Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 17, Problem 73Q
To determine
To explain:
The role of the Doppler shift in analyzing spectroscopic binaries.
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Chapter 17 Solutions
Universe: Stars And Galaxies
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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_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_forward
- 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 4arrow_forwardExplain why the sky is blue and how that relates to reflection nebulae.arrow_forwardIn a laboratory, the Balmer-beta spectral line of hydrogen has a wavelength of 486.1 nm . If the line appears in a star’s spectrum at 485.8 nm , what is the star’s radial velocity? Is it approaching or receding? Is this a blueshift or a redshift?arrow_forward
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