Universe: Stars And Galaxies
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 76Q
To determine

The reason of a star might not be round and how the light curve from an eclipsing binary might reveal a star’s shape.

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"51 Pegasi" is the name of the first normal star (besides the Sun) around which a planet was discovered. It is in the constellation Pegasus the horse. Its parallax is measured to be 0.064 arcsec. a. What is its distance from us? b. The apparent brightness is 1.79 × 10-10 J/(s·m2 ). What is the luminosity? How does that compare with that of the Sun? Look up the temperature: how do
Q9. If the luminosity of star B is 25 times the luminosity of star A, then find the distance of star A if you know that the two stars have the same brightness, and that star B is 10 astronomical leagues away from us. Use the relationship: BB V BA da dg Q10: If you know that the difference of the apparent magnitude between two stars is equal to 5 magnitudes. What is their brightness? Use this equation Am т 3D ть — т, — —2.5 logio Q11. If the apparent magnitude of the first star in a binary star system is equal 1m and the apparent magnitude of the second star is equal 2m. Calculate the apparent magnitude of the system. Q12. Calculate the distance of a star if you know that its absolute magnitude is equal to (2m) and its apparent magnitude (-2m).
Q10: If you know that the difference of the apparent magnitude between two stars is equal to 5 magnitudes. What is their brightness? Use this equation Am BB -2.5 log10 () = mb - ma = BA Q11. If the apparent magnitude of the first star in a binary star system is equal 1m and the apparent magnitude of the second star is equal 2m. Calculate the apparent magnitude of the system. Q12. Calculate the distance of a star if you know that its absolute magnitude is equal to (2m) and its apparent magnitude (-2m).

Chapter 17 Solutions

Universe: Stars And Galaxies

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