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Concept explainers
The radii of Rigel and Barnard’s star compared to a solar radius using the Stefan-Boltzmann equation and show that the values agree with the radii in figure 13.23.
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Answer to Problem 15P
The radii of Rigel is
Explanation of Solution
The luminosity of the Rigel star is
The luminosity of the Barnard’s star is
Write the Stefan-Boltzmann equation
Here,
Rearrange equation (I) to solve for
Divide
Substitute
Substitute
The radii indicated by the diagonal lines in figure 13.23 show that
Conclusion:
Thus, the radii of Rigel is
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Chapter 13 Solutions
Loose Leaf For Explorations: Introduction To Astronomy
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