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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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