Question 1

In the diagram below, which point indicates the location on the H-R diagram of a one-solar-mass star when it undergoes helium flash?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 2

A white dwarf is composed of

Accepted Answer

A)  hydrogen nuclei and degenerate electrons. 
B)  helium nuclei and normal electrons. 
C)  carbon and oxygen nuclei and degenerate electrons. 
D)  degenerate iron nuclei. 
E)  a helium burning core and a hydrogen burning shell. 
A)  hydrogen nuclei and degenerate electrons. 
B)  helium nuclei and normal electrons. 
C)  carbon and oxygen nuclei and degenerate electrons. 
D)  degenerate iron nuclei. 
E)  a helium burning core and a hydrogen burning shell.

Question 3

Where are elements heavier than iron primarily produced?

Accepted Answer

A)  brown dwarfs 
B)  white dwarfs 
C)  supergiants 
D)  supernovae 
A)  brown dwarfs 
B)  white dwarfs 
C)  supergiants 
D)  supernovae

Question 4

A nova destroys the star and leaves behind a white dwarf.

Accepted Answer

A) True 
 B)False

Question 5

A(n) ____ is a collection of 100 to 1000 stars in a region about 25 pc in diameter. The stars in the collection are typically quite young.

Accepted Answer

A)  Herbig-Haro object 
B)  globular cluster 
C)  open cluster 
D)  giant cluster 
E)  supernova 
A)  Herbig-Haro object 
B)  globular cluster 
C)  open cluster 
D)  giant cluster 
E)  supernova

Question 6

Stars that have ejected a planetary nebula eventually become

Accepted Answer

A)  protostars. 
B)  brown dwarfs. 
C)  white dwarfs. 
D)  red giants. 
A)  protostars. 
B)  brown dwarfs. 
C)  white dwarfs. 
D)  red giants.

Question 7

About how long will a 0.5-   star spend on the main sequence?

Accepted Answer

A)  5 billion years 
B)  57 billion years 
C)  570 million years 
D)  5 million years 
E)  500 thousand years 
A)  5 billion years 
B)  57 billion years 
C)  570 million years 
D)  5 million years 
E)  500 thousand years

Question 8

Giant and supergiant stars are rare because

Accepted Answer

A)  they do not form as often as main-sequence stars. 
B)  the star blows up before the giant or supergiant stage is reached 
C)  the giant or supergiant stage is very short. 
D)  the giant or supergiant stage is very long 
A)  they do not form as often as main-sequence stars. 
B)  the star blows up before the giant or supergiant stage is reached 
C)  the giant or supergiant stage is very short. 
D)  the giant or supergiant stage is very long

Question 9

As a white dwarf cools its radius will not change because

Accepted Answer

A)  pressure due to nuclear reactions in a shell just below the surface keeps it from collapsing. 
B)  pressure does not depend on temperature for a white dwarf because the electrons are degenerate. 
C)  pressure does not depend on temperature because the white dwarf is too hot. 
D)  pressure does not depend on temperature because the star has exhausted all its nuclear fuels. 
E)  material accreting onto it from a companion maintains a constant radius. 
A)  pressure due to nuclear reactions in a shell just below the surface keeps it from collapsing. 
B)  pressure does not depend on temperature for a white dwarf because the electrons are degenerate. 
C)  pressure does not depend on temperature because the white dwarf is too hot. 
D)  pressure does not depend on temperature because the star has exhausted all its nuclear fuels. 
E)  material accreting onto it from a companion maintains a constant radius.

Question 10

A(n) ____________________ supernova is caused by the collapse of a massive star that has lost its outer envelope of hydrogen.

Accepted Answer

The answer of A(n) ____________________ supernova is caused by the...

Question 11

The Chandrasekhar limit tells us that

Accepted Answer

A)  accretion disks can grow hot through friction. 
B)  neutron stars of more than 3 solar masses are not stable. 
C)  white dwarfs more massive than 1.4 solar masses are not stable. 
D)  stars cannot travel through space too fast. 
E)  stars with a mass less than 0.5 solar masses will not go through helium flash. 
A)  accretion disks can grow hot through friction. 
B)  neutron stars of more than 3 solar masses are not stable. 
C)  white dwarfs more massive than 1.4 solar masses are not stable. 
D)  stars cannot travel through space too fast. 
E)  stars with a mass less than 0.5 solar masses will not go through helium flash.

Question 12

Before it ejects a planetary nebula, a star is a

Accepted Answer

A)  red giant. 
B)  black hole. 
C)  white dwarf. 
D)  supernova. 
A)  red giant. 
B)  black hole. 
C)  white dwarf. 
D)  supernova.

Question 13

Stars less massive than 0.4 solar mass never become giant stars.

Accepted Answer

A) True 
 B)False

Question 14

A gas in which the pressure no longer depends on the temperature of the gas is said to be ____________________.

Accepted Answer

The answer of A gas in which the pressure no...

Question 15

A white dwarf star is prevented from collapsing by

Accepted Answer

A)  nuclear energy it is generating. 
B)  its gravitational force. 
C)  Hubble's law of extragalactic redshifts. 
D)  degenerate electron gas pressure. 
E)  degenerate astronomers observing the star. 
A)  nuclear energy it is generating. 
B)  its gravitational force. 
C)  Hubble's law of extragalactic redshifts. 
D)  degenerate electron gas pressure. 
E)  degenerate astronomers observing the star.

Question 16

What properties of degenerate matter are important to the structure of stars? Why?

Accepted Answer

The answer of What properties of degenerate matter are important...

Question 17

In A.D. 1054, Chinese astronomers observed the appearance of a new star, whose location is now occupied by

Accepted Answer

A)  a globular cluster. 
B)  a planetary nebulae. 
C)  a white dwarf. 
D)  a young massive star. 
E)  a supernova remnant. 
A)  a globular cluster. 
B)  a planetary nebulae. 
C)  a white dwarf. 
D)  a young massive star. 
E)  a supernova remnant.

Question 18

Type II supernovae are believed to occur when the cores of massive stars collapse.

Accepted Answer

A) True 
 B)False

Question 19

A nova is almost always associated with

Accepted Answer

A)  a very massive star. 
B)  a very young star. 
C)  a star undergoing helium flash. 
D)  a white dwarf in a close binary system. 
E)  a solar-like star that has exhausted its hydrogen and helium. 
A)  a very massive star. 
B)  a very young star. 
C)  a star undergoing helium flash. 
D)  a white dwarf in a close binary system. 
E)  a solar-like star that has exhausted its hydrogen and helium.

Question 20

The central star in a planetary nebula

Accepted Answer

A)  is a main-sequence star. 
B)  is a pre-main-sequence protostar. 
C)  is a neutron star. 
D)  will become a white dwarf. 
A)  is a main-sequence star. 
B)  is a pre-main-sequence protostar. 
C)  is a neutron star. 
D)  will become a white dwarf.

In the diagram below, which point indicates the location on the H-R diagram of a one-solar-mass star when it undergoes helium flash?

A white dwarf is composed of

Where are elements heavier than iron primarily produced?

A nova destroys the star and leaves behind a white dwarf.

A(n) ____ is a collection of 100 to 1000 stars in a region about 25 pc in diameter. The stars in the collection are typically quite young.

Stars that have ejected a planetary nebula eventually become

About how long will a 0.5- star spend on the main sequence?

Giant and supergiant stars are rare because

As a white dwarf cools its radius will not change because

A(n) ____________________ supernova is caused by the collapse of a massive star that has lost its outer envelope of hydrogen.

The Chandrasekhar limit tells us that

Before it ejects a planetary nebula, a star is a

Stars less massive than 0.4 solar mass never become giant stars.

A gas in which the pressure no longer depends on the temperature of the gas is said to be ____________________.

A white dwarf star is prevented from collapsing by

What properties of degenerate matter are important to the structure of stars? Why?

In A.D. 1054, Chinese astronomers observed the appearance of a new star, whose location is now occupied by

Type II supernovae are believed to occur when the cores of massive stars collapse.

A nova is almost always associated with

The central star in a planetary nebula

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

Exam 10: The Deaths of Stars

In the diagram below, which point indicates the location on the H-R diagram of a one-solar-mass star when it undergoes helium flash?

A white dwarf is composed of

Where are elements heavier than iron primarily produced?

A nova destroys the star and leaves behind a white dwarf.

A(n) ____ is a collection of 100 to 1000 stars in a region about 25 pc in diameter. The stars in the collection are typically quite young.

Stars that have ejected a planetary nebula eventually become

About how long will a 0.5- star spend on the main sequence?

Giant and supergiant stars are rare because

As a white dwarf cools its radius will not change because

A(n) ____________________ supernova is caused by the collapse of a massive star that has lost its outer envelope of hydrogen.

The Chandrasekhar limit tells us that

Before it ejects a planetary nebula, a star is a

Stars less massive than 0.4 solar mass never become giant stars.

A gas in which the pressure no longer depends on the temperature of the gas is said to be ____________________.

A white dwarf star is prevented from collapsing by

What properties of degenerate matter are important to the structure of stars? Why?

In A.D. 1054, Chinese astronomers observed the appearance of a new star, whose location is now occupied by

Type II supernovae are believed to occur when the cores of massive stars collapse.

A nova is almost always associated with

The central star in a planetary nebula

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