COSMIC PERSPECTIVE
COSMIC PERSPECTIVE
9th Edition
ISBN: 9780135729458
Author: Bennett
Publisher: PEARSON
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Chapter 15, Problem 45EAP
To determine

To explain:The difference between Proxima Centauri and Sirius.

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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
Sirius A has a luminosity of 26 Lsun and a surface temperature of about 9400 K. Part A What is its radius? (Hint: See Cosmic Calculations 12.2: Radius of a Star.) Express your answer using two significant figures. m Submit Previous Answers Request Answer
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