Concept explainers
(a)
The Spectral class for the brown dwarf
(a)
Answer to Problem 54Q
Solution:
L
Explanation of Solution
Given data:
The temperature of the brown dwarf star is
Introduction:
On the basis of temperature of the surface of stars, they are divided into different spectral classes.
Explanation:
Refer the table 17-2. The spectral sequence, the temperature and the brown dwarf lies to the Spectral class L.
Conclusion:
The temperature and the brown dwarf lie to the spectral class of L.
(b)
The radius (in kilometers) of
(b)
Answer to Problem 54Q
Solution:
Explanation of Solution
Given data:
Brown dwarf has a luminosity of
Formula used:
The relation between luminosity of different stars is:
Here,
Explanation:
The Sun’s surface temperature is,
The relation between luminosity of different stars is:
Substitute
Further solve,
Refer to Appendix 6, the value of Solar radius is
Therefore,
Therefore, the value of the radius in kilometer is
Now, refer to appendix 2, the value of the diameter of Jupiter is
Therefore, the radius of Jupiter is:
Expression for radius is:
Use this expression to determine the radius of Jupiter.
The radius of
Conclusion:
The name Dwarf is not justified as the radius is not much smaller, and also the value of the radius is
Want to see more full solutions like this?
Chapter 17 Solutions
Universe - Text Only (Looseleaf)
- H II regions can exist only if there is a nearby star hot enough to ionize hydrogen. Hydrogen is ionized only by radiation with wavelengths shorter than 91.2 nm. What is the temperature of a star that emits its maximum energy at 91.2 nm? (Use Wien’s law from Radiation and Spectra.) Based on this result, what are the spectral types of those stars likely to provide enough energy to produce H II regions?arrow_forwardSuppose you want to search for brown dwarfs using a space telescope. Will you design your telescope to detect light in the ultraviolet or the infrared part of the spectrum? Why?arrow_forward
- Stars and Galaxies (MindTap Course List)PhysicsISBN:9781337399944Author:Michael A. SeedsPublisher:Cengage LearningFoundations of Astronomy (MindTap Course List)PhysicsISBN:9781337399920Author:Michael A. Seeds, Dana BackmanPublisher:Cengage Learning
- AstronomyPhysicsISBN:9781938168284Author:Andrew Fraknoi; David Morrison; Sidney C. WolffPublisher:OpenStaxStars and GalaxiesPhysicsISBN:9781305120785Author:Michael A. Seeds, Dana BackmanPublisher:Cengage Learning