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 16, Problem 37EAP
To determine

To Discuss: Whether the basic picture of the model for star formation are convincing.

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Describe the helium flash and why it occurs.  a) Why don’t stars live forever? Which stars live the longest? b) What is the importance of 1.4 solar masses in stellar evolution? Relate hydrostatic equilibrium to the star's mass, composition, and evolution off the main sequence.
All massive main sequence stars reside in clouds of glowing gas. The four powerful stars in the center of the Orion Nebula are good examples. Lower mass stars like the Sun generally don't have clouds of gas around them. a. Why do powerful stars reside in gas clouds? b. What is making the gas glow exactly? For the last question, refer to the surface temperature of these stars, and to Wien's Law.
Based on what you learned about stellar structure and how stars maintain their stability, select all of the correct statements from the following list. 1. The weight pressing down on a layer of gas in a star is balanced by the pressure in the gas. 2. The interior of the lowest-mass stars transfers energy mostly through convection. 3. Energy in a star flows from the core to the surface. 4. More massive stars produce energy with the proton-proton cycle. 5. Less massive stars produce energy with the CNO cycle. 6. Conduction is an important method of energy transport in stars. 7. Stars are hotter in their cores than on their surfaces.
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