Explorations: Introduction to Astronomy (Arny), 6th Edition

Chapter 14: Stellar Evolution

Questions for Review

1
Sketch an H-R diagram of the evolutionary path of the Sun.
2
Sketch an H-R diagram of the evolutionary path of a 15Msun star.
3
Describe how a protostar is believed to form.
4
What heats a protostar?
5
What is a bipolar flow?
6
How can we observe protostars? Why are they surrounded by dust and gas?
7
What is a T Tauri star?
8
What is a Bok globule?
9
What determines when a star becomes a main-sequence star?
10
What determines how long a star stays on the main sequence?
11
What makes a star move off the main sequence?
12
Where do main-sequence stars end up as they evolve?
13
Why do high- and low-mass stars evolve differently as they become red giants?
14
Why is it easier for a high-mass star than for a low-mass star to burn helium?
15
What is meant by a pulsating star?
16
Why do stars pulsate?
17
What happens to a solar-mass star when it starts to burn helium in its core? What does it turn into?
18
What is a planetary nebula?
19
What is one explanation for how a low-mass star expels its outer layers to make a planetary nebula?
20
What is left when a planetary nebula dissipates?
21
What makes a high-mass star's core collapse?
22
How do the neutrons form in a massive star's remnant core? What other kind of particle is made along with the neutrons?
23
What is a supernova explosion?
24
What kind of subatomic particles have been observed when a supernova explodes?
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