Question 1

Noting the turnoff mass in a star cluster allows you to determine its:

Accepted Answer

A)   distance.
B)   radial velocity.
C)   age.
D)   total mass.
E)   number of stars.

Question 2

The longest stage in the life cycle of a star is as a(n)________ star.

Accepted Answer

The answer of The longest stage in the life cycle...

Question 3

The age of a star cluster may be estimated by determining the ________ of the Main Sequence at which stars are just in the process of evolving away to become giant stars.

Accepted Answer

The answer of The age of a star cluster may...

Question 4

Low mass stars should produce white dwarfs,while high mass stars will produce more compact end products.

Accepted Answer

A) True 
 B)False

Question 5

A star (no matter what its mass) spends most of its life:

Accepted Answer

A)   as a protostar.
B)   as a main sequence star.
C)   as a planetary nebula.
D)   as a red giant or supergiant.
E)   as a T Tauri variable star.

Question 6

How is the age of a star cluster determined?

Accepted Answer

The stars are plotted on an H-R diagram....

Question 7

For our Sun,the production of carbon will be the end of its nucleosynthesis.

Accepted Answer

A) True 
 B)False

Question 8

What is the significance of 8 solar masses in stellar evolution?

Accepted Answer

Above 8 solar masses,a high mass star mu...

Question 9

How has the chemical composition of the core of the Sun changed in the past 4.5 billion years? Are earthlings (if any)likely to freeze in another 4-5 billion years? Explain.

Accepted Answer

The core of the Sun had an initial compo...

Question 10

A star is on the horizontal branch of the H-R diagram.Which statement is true?

Accepted Answer

A)   It is burning both hydrogen and helium.
B)   It is about to experience the helium flash.
C)   It is burning only helium.
D)   The star is contracting.
E)   The star is about to return to the main sequence.

Question 11

What is peculiar about Sirius based on historical records?

Accepted Answer

Records from 100 B.C.to 200 A....

Question 12

What is the typical age for a globular cluster associated with our Milky Way?

Accepted Answer

A)   a few million years
B)   200 million years
C)   a billion years
D)   10-12 billion years
E)   45 billion years

Question 13

Modern astronomers have observed the complete life cycle for many stars,making stellar evolution one of the best-tested astronomical theories.

Accepted Answer

A) True 
 B)False

Question 14

As a 4-10 solar mass star leaves the main sequence on its way to becoming a red supergiant,its luminosity:

Accepted Answer

A)   decreases.
B)   first decreases, then increases.
C)   increases.
D)   remains roughly constant.
E)   first increases, then decreases.

Question 15

The order of evolutionary stages of a star like the Sun would be Main Sequence,giant,planetary nebula,and finally:

Accepted Answer

A)   hypernova.
B)   neutron star.
C)   white dwarf.
D)   nova.
E)   black hole.

Question 16

Eventually,all low mass stars will become white,then black,dwarfs.

Accepted Answer

A) True 
 B)False

Question 17

Mass transfer will almost always occur for spectroscopic and eclipsing binaries.

Accepted Answer

A) True 
 B)False

Question 18

A high-mass star dies more violently than a low-mass star because:

Accepted Answer

A)   it must always end up as a black hole.
B)   it generates more heat and its core eventually collapses very suddenly.
C)   it cannot fuse elements heavier than carbon.
D)   gravity is weakened by its high luminosity.
E)   it is most often found as part of a binary system.

Question 19

A solar mass star will evolve off the main sequence when:

Accepted Answer

A)   it completely runs out of hydrogen.
B)   it expels a planetary nebula to cool off and release radiation.
C)   it explodes as a violent nova.
D)   it builds up a core of inert helium.
E)   it loses all its neutrinos, so fusion must cease.

Question 20

Isolated main-sequence stars as massive as 10 to 12 times the mass of the Sun may still manage to avoid going supernova.Why?

Accepted Answer

A)   because they can also have strong stellar winds
B)   because about half that mass will be contained in the carbon core
C)   because they would be classified as brown dwarfs
D)   because these stars will eject at least 4 solar masses in the planetary nebula stage
E)   because their masses will decrease as they fuse heavy elements into lighter elements in their cores

Exam 20: Stellar Evolution: The Life and Death of a Star

Low mass stars should produce white dwarfs,while high mass stars will produce more compact end products.

Correct AnswerverifiedShow Answer

What is peculiar about Sirius based on historical records?

Correct AnswerverifiedRecords from 100 B.C.to 200 A....View AnswerShow Answer

How is the age of a star cluster determined?

Correct AnswerverifiedThe stars are plotted on an H-R diagram....View AnswerShow Answer

What is the typical age for a globular cluster associated with our Milky Way?

Correct AnswerverifiedShow Answer

How has the chemical composition of the core of the Sun changed in the past 4.5 billion years? Are earthlings (if any)likely to freeze in another 4-5 billion years? Explain.

Correct AnswerverifiedThe core of the Sun had an initial compo...View AnswerShow Answer

A star is on the horizontal branch of the H-R diagram.Which statement is true?

Correct AnswerverifiedShow Answer

A high-mass star dies more violently than a low-mass star because:

Correct AnswerverifiedShow Answer

The order of evolutionary stages of a star like the Sun would be Main Sequence,giant,planetary nebula,and finally:

Correct AnswerverifiedShow Answer

For our Sun,the production of carbon will be the end of its nucleosynthesis.

Correct AnswerverifiedShow Answer

What is the significance of 8 solar masses in stellar evolution?

Correct AnswerverifiedAbove 8 solar masses,a high mass star mu...View AnswerShow Answer

A solar mass star will evolve off the main sequence when:

Correct AnswerverifiedShow Answer

Isolated main-sequence stars as massive as 10 to 12 times the mass of the Sun may still manage to avoid going supernova.Why?

Correct AnswerverifiedShow Answer

The age of a star cluster may be estimated by determining the ________ of the Main Sequence at which stars are just in the process of evolving away to become giant stars.

Correct AnswerverifiedShow Answer

A star (no matter what its mass) spends most of its life:

Correct AnswerverifiedShow Answer

Mass transfer will almost always occur for spectroscopic and eclipsing binaries.

Correct AnswerverifiedShow Answer

The longest stage in the life cycle of a star is as a(n)________ star.

Correct AnswerverifiedShow Answer

Eventually,all low mass stars will become white,then black,dwarfs.

Correct AnswerverifiedShow Answer

Modern astronomers have observed the complete life cycle for many stars,making stellar evolution one of the best-tested astronomical theories.

Correct AnswerverifiedShow Answer

Noting the turnoff mass in a star cluster allows you to determine its:

Correct AnswerverifiedShow Answer

As a 4-10 solar mass star leaves the main sequence on its way to becoming a red supergiant,its luminosity:

Correct AnswerverifiedShow Answer

Correct Answer
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Records from 100 B.C.to 200 A....
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The stars are plotted on an H-R diagram....
View Answer

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The core of the Sun had an initial compo...
View Answer

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Above 8 solar masses,a high mass star mu...
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