The Cosmic Perspective (9th Edition)
The Cosmic Perspective (9th Edition)
9th Edition
ISBN: 9780134874364
Author: Jeffrey O. Bennett, Megan O. Donahue, Nicholas Schneider, Mark Voit
Publisher: PEARSON
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Chapter 15, Problem 40EAP
To determine

To Discuss: The role of modern system of stellar classification in making rapid advances in the understanding of stars.

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Astronomy   Briefly explain what evidence we can use to learn about the lives of stars even though their lives are far longer than human lives.   Why do HR diagrams look different for star clusters of different ages? How do we use the diagram to determine the age of the cluster?   How can we estimate how much longer the lifetime of a low-mass star is than the lifetime of a high-mass star?   How do we use parallax to measure the distance to stars?   Explain the inverse square law for light. If we know the distance to a star, how do we find its luminosity? If we know the luminosity of a star, how do we find the distance?   What are apparent magnitude and absolute magnitude? How do they relate to apparent brightness and luminosity?   What is meant by spectral type? What spectral type is the hottest? Which is the coolest?   What is meant by luminosity class?   What are the three basic types of binary stars?
A planet orbits 1 AU from a star that is 3.5 times as massive as our Sun. How does the star's luminosity compare?   Use the mass-luminosity relation to calculate the luminosity. If the star has the same radius as our Sun, what is the temperature of the star compared to the Sun?   If Earth's average temperature is 287 K and the Sun were replaced with this star, how would its average temperature change? (Enter a temperature in K. Assume that Earth temperature is proportional to solar flux.)
how is the rotation curve method related to binary stars and Kepler’s third law?
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