Universe
Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Concept explainers

Stellar evolution
We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars d…
Red Shift
It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths…
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Chapter 17, Problem 62Q
To determine

The information about stars that the astronomers gather from the binary system, and measurements made by them so as to evaluate this information.

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Calculate the main-sequence lifetimes of (a) a 4 ?⨀ star, and (b) a 0.75 ?⨀ star. Express the lifetimes of these stars as multiples of the Sun’s lifetime (?⨀ =1010 years), as well as in units of years.
Show that if two stars of the same luminosity form a close binary pair, the magnitude apparent light of the pair measured together is about 0.75 magnitudes brighter than any of the individual stars.

Chapter 17 Solutions

Universe

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