Question 1

From what part of the H-R diagram have the giants in a star cluster evolved?

Accepted Answer

Answer not provided.

Question 2

Star clusters are important to our study of the lives of high-mass versus low-mass stars because

Accepted Answer

A)  stars in each cluster all formed at about the same time all with the same mass. 
B)  the sun was once a member of a globular cluster. 
C)  stars in each cluster all formed at about the same time but with differing masses. 
D)  stars in each cluster all formed at different times with differing masses. 
E)  all of the above. 
A)  stars in each cluster all formed at about the same time all with the same mass. 
B)  the sun was once a member of a globular cluster. 
C)  stars in each cluster all formed at about the same time but with differing masses. 
D)  stars in each cluster all formed at different times with differing masses. 
E)  all of the above. C

Question 3

Stars within a cluster that are at the turnoff point

Accepted Answer

A)  have life expectancies that are equal to the age of the cluster. 
B)  are stars that are just becoming white dwarfs. 
C)  are stars that are just entering the main sequence portion of their evolution. 
D)  are stars that are about to supernova. 
E)  are stars that are generally spectral type G stars. 
A)  have life expectancies that are equal to the age of the cluster. 
B)  are stars that are just becoming white dwarfs. 
C)  are stars that are just entering the main sequence portion of their evolution. 
D)  are stars that are about to supernova. 
E)  are stars that are generally spectral type G stars. A

Question 4

White dwarf stars are formed from

Accepted Answer

A)  the most massive main-sequence stars. 
B)  lower-mass main-sequence stars. 
C)  A main sequence star stays a main-sequence star forever. 
D)  Main-sequence stars are formed from white dwarf stars. 
A)  the most massive main-sequence stars. 
B)  lower-mass main-sequence stars. 
C)  A main sequence star stays a main-sequence star forever. 
D)  Main-sequence stars are formed from white dwarf stars.

Question 5

The lowest-mass stars cannot become giants because

Accepted Answer

A)  they do not contain helium. 
B)  they rotate too slowly. 
C)  they cannot heat their centers hot enough. 
D)  they contain strong magnetic fields. 
E)  they never use up their hydrogen. 
A)  they do not contain helium. 
B)  they rotate too slowly. 
C)  they cannot heat their centers hot enough. 
D)  they contain strong magnetic fields. 
E)  they never use up their hydrogen.

Question 6

The maximum mass of a white dwarf is ____________________ solar masses.

Accepted Answer

The answer of The maximum mass of a white dwarf...

Question 7

In star clusters, the ____ stars are giant stars fusing helium in their cores and then in their shells.

Accepted Answer

A)  turnoff-point 
B)  main-sequence 
C)  turnon-point 
D)  hydrogen-flash 
E)  horizontal-branch 
A)  turnoff-point 
B)  main-sequence 
C)  turnon-point 
D)  hydrogen-flash 
E)  horizontal-branch

Question 8

If the theory that novae occur in close binary systems is correct, then novae should

Accepted Answer

A)  produce synchrotron radiation. 
B)  occur in regions of star formation. 
C)  not occur in old star clusters. 
D)  all be visual binaries. 
E)  repeat after some interval. 
A)  produce synchrotron radiation. 
B)  occur in regions of star formation. 
C)  not occur in old star clusters. 
D)  all be visual binaries. 
E)  repeat after some interval.

Question 9

Some massive stars only live a few million years.

Accepted Answer

A) True 
 B)False

Question 10

____ is a form of electromagnetic radiation produced by rapidly moving electrons spiraling through magnetic fields.

Accepted Answer

A)  Lagrangian radiation 
B)  Accretion 
C)  Ultraviolet radiation 
D)  Synchrotron radiation 
E)  Infrared radiation 
A)  Lagrangian radiation 
B)  Accretion 
C)  Ultraviolet radiation 
D)  Synchrotron radiation 
E)  Infrared radiation

Question 11

Electrons moving in a strong magnetic field emit ____________________ radiation.

Accepted Answer

The answer of Electrons moving in a strong magnetic field...

Question 12

Why do higher-mass stars live shorter lives on the main sequence than lower-mass stars?

Accepted Answer

A)  Higher-mass stars burn through their nuclear fuel faster. 
B)  Lower-mass stars don't get their energy from that same nuclear fusion source as higher-mass stars. 
C)  Higher-mass stars have less hydrogen fuel to burn. 
D)  Lower-mass stars spend a longer time evolving to the main sequence. 
E)  All of the above are false. 
A)  Higher-mass stars burn through their nuclear fuel faster. 
B)  Lower-mass stars don't get their energy from that same nuclear fusion source as higher-mass stars. 
C)  Higher-mass stars have less hydrogen fuel to burn. 
D)  Lower-mass stars spend a longer time evolving to the main sequence. 
E)  All of the above are false.

Question 13

A(n) ____________________ is the expulsion of the outer layers of a moderate-mass star that has a degenerate carbon and oxygen core.

Accepted Answer

The answer of A(n) ____________________ is the expulsion of the...

Question 14

The age of a star cluster can be determined from the ____________________ of the cluster.

Accepted Answer

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

Question 15

A star will experience a helium flash if

Accepted Answer

A)  it is less massive than about 3 solar masses. 
B)  it has become a red giant star. 
C)  it has formed a helium core. 
D)  the material in the core has gradually become degenerate. 
E)  All of the above must be true. 
A)  it is less massive than about 3 solar masses. 
B)  it has become a red giant star. 
C)  it has formed a helium core. 
D)  the material in the core has gradually become degenerate. 
E)  All of the above must be true.

Question 16

Stars with masses between 0.4-   and 4-

Accepted Answer

A)  undergo thermonuclear fusion of hydrogen and helium, but never get hot enough to ignite carbon. 
B)  undergo thermonuclear fusion of hydrogen, but never get hot enough to ignite helium. 
C)  produce type I supernovae after they exhaust their nuclear fuels. 
D)  produce type II supernovae after they exhaust their nuclear fuels. 
E)  undergo carbon detonation. 
A)  undergo thermonuclear fusion of hydrogen and helium, but never get hot enough to ignite carbon. 
B)  undergo thermonuclear fusion of hydrogen, but never get hot enough to ignite helium. 
C)  produce type I supernovae after they exhaust their nuclear fuels. 
D)  produce type II supernovae after they exhaust their nuclear fuels. 
E)  undergo carbon detonation.

Question 17

What is the approximate age of the star cluster in the H-R diagram below? Hint: Main-sequence stars of spectral types between A and B have core supplies of hydrogen sufficient to last about 250 million years, between A and F about 2 billion years, type G about 10 billion years, and between K and M about 30 billion years.

Accepted Answer

A)  200 million years 
B)  2 billion years 
C)  10 billion years 
D)  30 billion years 
E)  The age of the cluster cannot be estimated from an H-R diagram of the cluster. 
A)  200 million years 
B)  2 billion years 
C)  10 billion years 
D)  30 billion years 
E)  The age of the cluster cannot be estimated from an H-R diagram of the cluster.

Question 18

A white dwarf whose red giant companion dumps hydrogen onto it may

Accepted Answer

A)  show no effect. 
B)  explode recurrently as a nova. 
C)  blow up as a type I supernova. 
D)  answers B or C 
A)  show no effect. 
B)  explode recurrently as a nova. 
C)  blow up as a type I supernova. 
D)  answers B or C

Question 19

What will eventually happen to a star after its formation is most affected by its initial

Accepted Answer

A)  speed through space. 
B)  oxygen content. 
C)  uranium content. 
D)  anti-matter content. 
E)  mass. 
A)  speed through space. 
B)  oxygen content. 
C)  uranium content. 
D)  anti-matter content. 
E)  mass.

Question 20

The figure shows an HST image of the red giant star, Betelgeuse. In the red giant stage, hydrogen is being fused to helium

Accepted Answer

A)  on the surface of the star. 
B)  in the center of the star's helium core. 
C)  on the outside of the star's helium core. 
D)  Neither helium nor hydrogen is being fused in the red giant stage. 
A)  on the surface of the star. 
B)  in the center of the star's helium core. 
C)  on the outside of the star's helium core. 
D)  Neither helium nor hydrogen is being fused in the red giant stage.

From what part of the H-R diagram have the giants in a star cluster evolved?

Star clusters are important to our study of the lives of high-mass versus low-mass stars because

Stars within a cluster that are at the turnoff point

White dwarf stars are formed from

The lowest-mass stars cannot become giants because

The maximum mass of a white dwarf is ____________________ solar masses.

In star clusters, the ____ stars are giant stars fusing helium in their cores and then in their shells.

If the theory that novae occur in close binary systems is correct, then novae should

Some massive stars only live a few million years.

____ is a form of electromagnetic radiation produced by rapidly moving electrons spiraling through magnetic fields.

Electrons moving in a strong magnetic field emit ____________________ radiation.

Why do higher-mass stars live shorter lives on the main sequence than lower-mass stars?

A(n) ____________________ is the expulsion of the outer layers of a moderate-mass star that has a degenerate carbon and oxygen core.

The age of a star cluster can be determined from the ____________________ of the cluster.

A star will experience a helium flash if

Stars with masses between 0.4- and 4-

A white dwarf whose red giant companion dumps hydrogen onto it may

What will eventually happen to a star after its formation is most affected by its initial

The figure shows an HST image of the red giant star, Betelgeuse. In the red giant stage, hydrogen is being fused to helium

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Formation and Structure of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies: Normal and Active

Modern Cosmology

The Origin of the Solar System

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

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Exam 10: The Deaths of Stars

From what part of the H-R diagram have the giants in a star cluster evolved?

Star clusters are important to our study of the lives of high-mass versus low-mass stars because

Stars within a cluster that are at the turnoff point

White dwarf stars are formed from

The lowest-mass stars cannot become giants because

The maximum mass of a white dwarf is ____________________ solar masses.

In star clusters, the ____ stars are giant stars fusing helium in their cores and then in their shells.

If the theory that novae occur in close binary systems is correct, then novae should

Some massive stars only live a few million years.

____ is a form of electromagnetic radiation produced by rapidly moving electrons spiraling through magnetic fields.

Electrons moving in a strong magnetic field emit ____________________ radiation.

Why do higher-mass stars live shorter lives on the main sequence than lower-mass stars?

A(n) ____________________ is the expulsion of the outer layers of a moderate-mass star that has a degenerate carbon and oxygen core.

The age of a star cluster can be determined from the ____________________ of the cluster.

A star will experience a helium flash if

Stars with masses between 0.4- and 4-

A white dwarf whose red giant companion dumps hydrogen onto it may

What will eventually happen to a star after its formation is most affected by its initial

The figure shows an HST image of the red giant star, Betelgeuse. In the red giant stage, hydrogen is being fused to helium

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Formation and Structure of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies: Normal and Active

Modern Cosmology

The Origin of the Solar System

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

Filters