Explorations: An Introduction to Astronomy (Arny), 7th Edition

Chapter 14: Stellar Evolution

Questions for Review

1
What processes and forces determine the structure of stars?
2
Through what stages will the Sun evolve? Through what stages will a high-mass star evolve?
3
What heats a protostar? How can we observe protostars? Why are they surrounded by dust and gas?
4
What is a bipolar flow?
5
What is a T Tauri star?
6
What is a Bok globule?
7
What determines when a star becomes a main sequence star?
8
How long do stars stay on the main sequence?
9
What makes a star move off the main sequence?
10
Where do main-sequence stars end up as they evolve?
11
Why is it easier for a high-mass star than for a low-mass star to burn helium?
12
Why do high- and low-mass stars evolve differently as they become red giants?
13
What is a variable star? What is meant by the period of a variable star?
14
Where in the H-R diagram are variable stars found?
15
What is meant by a pulsating star? Why do stars pulsate?
16
What happens to a solar-mass star when it starts to burn helium in its core? What does it turn into?
17
What is a planetary nebula?
18
What is one explanation for how a low-mass star expels its outer layers to make a planetary nebula?
19
What is left when a planetary nebula dissipates?
20
What makes a high-mass star's core collapse?
21
Why do neutrons form in a massive star's iron core?
22
What is a supernova explosion?
23
What kind of subatomic particles have been observed when a supernova explodes?
24
How are clusters of stars used to test theories of stellar evolution?
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