Question 1

How can we be certain that white dwarfs are very small?

Accepted Answer

The answer of How can we be certain that white...

Question 2

The most massive main-sequence stars are the M stars.

Accepted Answer

A) True 
 B)False

Question 3

Most stars on the H-R diagram are on the ____________________.

Accepted Answer

The answer of Most stars on the H-R diagram are...

Question 4

In a binary system, the more massive star

Accepted Answer

A)  is at the center of mass. 
B)  is farthest from the center of mass. 
C)  is nearest the center of mass. 
D)  follows the largest orbit. 
E)  shows a larger Doppler shift in its spectral lines. 
A)  is at the center of mass. 
B)  is farthest from the center of mass. 
C)  is nearest the center of mass. 
D)  follows the largest orbit. 
E)  shows a larger Doppler shift in its spectral lines.

Question 5

White dwarfs have such a low luminosity that even the nearest white dwarfs are not visible to the naked eye.

Accepted Answer

A) True 
 B)False

Question 6

The star HR 4621 has an apparent magnitude of 2.6 and an absolute magnitude of -0.3. This star is at a distance

Accepted Answer

A)  closer than 10 pc. 
B)  farther than 10 pc. 
C)  No way to tell. 
A)  closer than 10 pc. 
B)  farther than 10 pc. 
C)  No way to tell.

Question 7

The hydrogen lines in spectral type A stars

Accepted Answer

A)  are most narrow for supergiants. 
B)  are most narrow for main-sequence stars. 
C)  can not be used to estimate the luminosity of the star. 
D)  are very weak and difficult to see. 
E)  are useful in determining the apparent magnitude of the star. 
A)  are most narrow for supergiants. 
B)  are most narrow for main-sequence stars. 
C)  can not be used to estimate the luminosity of the star. 
D)  are very weak and difficult to see. 
E)  are useful in determining the apparent magnitude of the star.

Question 8

How do astronomers know that the newly found L and T spectral types represent objects cooler than M spectral class?

Accepted Answer

The answer of How do astronomers know that the newly...

Question 9

If a star with an absolute magnitude of -5 has an apparent magnitude of +5, then its distance is

Accepted Answer

A)  1 pc. 
B)  10 pc. 
C)  100 pc. 
D)  1000 pc. 
E)  10,000 pc. 
A)  1 pc. 
B)  10 pc. 
C)  100 pc. 
D)  1000 pc. 
E)  10,000 pc.

Question 10

A pair of stars orbit around one another in an elliptical orbit with a semimajor axis, a, of 1 AU with an orbital period, P, of 1 year. What is the mass of the pair of stars?

Accepted Answer

A)  1 solar masses 
B)  2 solar masses 
C)  4 solar masses 
D)  8 solar masses 
E)  16 solar masses 
A)  1 solar masses 
B)  2 solar masses 
C)  4 solar masses 
D)  8 solar masses 
E)  16 solar masses

Question 11

Which of the following kinds of stars best obey the mass-luminosity relation?

Accepted Answer

A)  main-sequence stars 
B)  giant stars 
C)  supergiant stars 
D)  white dwarfs 
E)  all of the above 
A)  main-sequence stars 
B)  giant stars 
C)  supergiant stars 
D)  white dwarfs 
E)  all of the above

Question 12

The largest of the red stars are the ____________________ stars.

Accepted Answer

The answer of The largest of the red stars are...

Question 13

How is a luminosity class assigned to a star?

Accepted Answer

A)  by combining the apparent magnitude with the star's parallax 
B)  by measuring the period of variability in the star's apparent magnitude 
C)  by studying the absorption line width in the spectrum of the star 
D)  by observing the angular size of the star's image in a photograph or digital image 
A)  by combining the apparent magnitude with the star's parallax 
B)  by measuring the period of variability in the star's apparent magnitude 
C)  by studying the absorption line width in the spectrum of the star 
D)  by observing the angular size of the star's image in a photograph or digital image

How can we be certain that white dwarfs are very small?

The most massive main-sequence stars are the M stars.

Most stars on the H-R diagram are on the ____________________.

In a binary system, the more massive star

White dwarfs have such a low luminosity that even the nearest white dwarfs are not visible to the naked eye.

The star HR 4621 has an apparent magnitude of 2.6 and an absolute magnitude of -0.3. This star is at a distance

The hydrogen lines in spectral type A stars

How do astronomers know that the newly found L and T spectral types represent objects cooler than M spectral class?

If a star with an absolute magnitude of -5 has an apparent magnitude of +5, then its distance is

A pair of stars orbit around one another in an elliptical orbit with a semimajor axis, a, of 1 AU with an orbital period, P, of 1 year. What is the mass of the pair of stars?

Which of the following kinds of stars best obey the mass-luminosity relation?

The largest of the red stars are the ____________________ stars.

How is a luminosity class assigned to a star?

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 Formation and Structure of Stars

The Deaths 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 8: The Family of Stars

How can we be certain that white dwarfs are very small?

The most massive main-sequence stars are the M stars.

Most stars on the H-R diagram are on the ____________________.

In a binary system, the more massive star

White dwarfs have such a low luminosity that even the nearest white dwarfs are not visible to the naked eye.

The star HR 4621 has an apparent magnitude of 2.6 and an absolute magnitude of -0.3. This star is at a distance

The hydrogen lines in spectral type A stars

How do astronomers know that the newly found L and T spectral types represent objects cooler than M spectral class?

If a star with an absolute magnitude of -5 has an apparent magnitude of +5, then its distance is

A pair of stars orbit around one another in an elliptical orbit with a semimajor axis, a, of 1 AU with an orbital period, P, of 1 year. What is the mass of the pair of stars?

Which of the following kinds of stars best obey the mass-luminosity relation?

The largest of the red stars are the ____________________ stars.

How is a luminosity class assigned to a star?

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 Formation and Structure of Stars

The Deaths 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