Question 1

Our Sun will eventually become a nova.

Accepted Answer

A) True 
 B)False

Question 2

Rather than an explosive death, the Sun will likely end its life forming a(n) surrounding a(n) .

Accepted Answer

planetary ...

Question 3

Elements heavier than iron are formed mainly in supernovae.

Accepted Answer

A) True 
 B)False

Question 4

Which of these evolutionary paths is the fate of our Sun?

Accepted Answer

A)   supernova of Type II
B)   nova
C)   planetary nebula
D)   brown dwarf
E)   supernova of Type IF) B) and E)
G) A) and B)

Question 5

White dwarfs were once the cores of stars that produced planetary nebulae.

Accepted Answer

A) True 
 B)False

Question 6

The track is the path the star takes on the H- R diagram as it ages.

Accepted Answer

The answer of The track is the path the star...

Question 7

Why do blue stragglers stand out in globular clusters?

Accepted Answer

They are much bluer and apparently young...

Question 8

Which of these does NOT depend on a close binary system to occur?

Accepted Answer

A)   a Type II supernova
B)   a nova
C)   a Type I supernova
D)   All of these need mass transfer to occur.
E)   None of these depends on mass transfer.F) A) and C)
G) A) and B)

Question 9

Which is used observationally to determine the age of a star cluster?

Accepted Answer

A)   the total number of main- sequence stars
B)   the amount of dust that lies around the cluster
C)   the ratio of giants to supergiants
D)   the luminosity of the main- sequence turn- off point
E)   the number of white dwarfsF) A) and E)
G) A) and B)

Question 10

A typical star burns helium for about the same amount of time it burns hydrogen.

Accepted Answer

A) True 
 B)False

Question 11

Stars of type should last about ten billion years on the main sequence.

Accepted Answer

The answer of Stars of type should last about ten...

Question 12

Novae are more closely related to Type II than to Type I supernovae.

Accepted Answer

A) True 
 B)False

Question 13

Why can we say a star spends its life trying to maintain equilibrium?

Accepted Answer

A star is only stable when the...

Question 14

Our Sun will likely die as a Type I supernova in about five billion years.

Accepted Answer

A) True 
 B)False

Question 15

The helium flash stage lasts several thousand years.

Accepted Answer

A) True 
 B)False

Question 16

High- precision observations by the Hubble Space Telescope have revealed what as- yet unexplained phenomenon in globular clusters?

Accepted Answer

There appear to be three distinct main s...

Question 17

Can a star become a red giant more than once?

Accepted Answer

A)   no, or we would see them as the majority of naked- eye stars
B)   no, it will lose so much mass as to cross the Chandrasekhar Limit
C)   yes, before and after the helium flash
D)   yes, before and after the Type II supernova event
E)   no, the planetary nebula blows off all the outer shells completelyF) C) and D)
G) A) and D)

Question 18

What was most surprising about SN1987A?

Accepted Answer

A)   It did not produce the flood of neutrinos our models had led us to expect.
B)   The parent star was a blue supergiant, much like Deneb or Rigel.
C)   The supernova was luminous enough to see with the naked eye.
D)   Its pulsar appeared within weeks of the explosion.
E)   The supernova was not even in our own Galaxy.F) C) and D)
G) B) and E)

Question 19

What element are white dwarfs made of? Why?

Accepted Answer

White dwarfs consist mainly of...

Question 20

Black dwarfs are

Accepted Answer

A)   very common, making up the majority of the dark matter in the universe.
B)   often made from very low mass protostars that never fuse hydrogen.
C)   rare, for few binary systems are close enough for this merger to happen.
D)   rare, for collapsing cores of over three solar masses are uncommon.
E)   not found yet; the oldest, coldest white dwarf in the Galaxy has not cooled enough yet.F) B) and D)
G) A) and E)

Exam 13: Stellar Evolution: the Lives and Deaths of Stars

Our Sun will eventually become a nova.

Correct AnswerverifiedShow Answer

High- precision observations by the Hubble Space Telescope have revealed what as- yet unexplained phenomenon in globular clusters?

Correct AnswerverifiedThere appear to be three distinct main s...View AnswerShow Answer

Elements heavier than iron are formed mainly in supernovae.

Correct AnswerverifiedShow Answer

Which of these evolutionary paths is the fate of our Sun?

Correct AnswerverifiedShow Answer

What element are white dwarfs made of? Why?

Correct AnswerverifiedWhite dwarfs consist mainly of...View AnswerShow Answer

A typical star burns helium for about the same amount of time it burns hydrogen.

Correct AnswerverifiedShow Answer

Can a star become a red giant more than once?

Correct AnswerverifiedShow Answer

White dwarfs were once the cores of stars that produced planetary nebulae.

Correct AnswerverifiedShow Answer

Novae are more closely related to Type II than to Type I supernovae.

Correct AnswerverifiedShow Answer

Our Sun will likely die as a Type I supernova in about five billion years.

Correct AnswerverifiedShow Answer

The helium flash stage lasts several thousand years.

Correct AnswerverifiedShow Answer

The track is the path the star takes on the H- R diagram as it ages.

Correct AnswerverifiedShow Answer

Why do blue stragglers stand out in globular clusters?

Correct AnswerverifiedThey are much bluer and apparently young...View AnswerShow Answer

Which of these does NOT depend on a close binary system to occur?

Correct AnswerverifiedShow Answer

What was most surprising about SN1987A?

Correct AnswerverifiedShow Answer

Rather than an explosive death, the Sun will likely end its life forming a(n) surrounding a(n) .

Correct Answerverifiedplanetary ...View AnswerShow Answer

Black dwarfs are

Correct AnswerverifiedShow Answer

Which is used observationally to determine the age of a star cluster?

Correct AnswerverifiedShow Answer

Stars of type should last about ten billion years on the main sequence.

Correct AnswerverifiedShow Answer

Why can we say a star spends its life trying to maintain equilibrium?

Correct AnswerverifiedA star is only stable when the...View AnswerShow Answer

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There appear to be three distinct main s...
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White dwarfs consist mainly of...
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They are much bluer and apparently young...
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planetary ...
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A star is only stable when the...
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