Question 1

What is the most reliable way to measure the mass of a star for which the distance is unknown?

Accepted Answer

A) Apply the mass-temperature relation. 
B) Measure its orbit around another star. 
C) Measure its radius, then compute its volume and multiply by density to get the mass. 
D) Compute its spectroscopic parallax, then apply the mass-luminosity relation. 
A) Apply the mass-temperature relation. 
B) Measure its orbit around another star. 
C) Measure its radius, then compute its volume and multiply by density to get the mass. 
D) Compute its spectroscopic parallax, then apply the mass-luminosity relation.

Question 2

Luminosity class IV objects are known as ____________________.

Accepted Answer

The answer of Luminosity class IV objects are known as...

Question 3

Which of the following pieces of information are needed to calculate the total mass of a binary system?

Accepted Answer

A) the ratio of the angular separation from the centre of mass of each of the stars 
B) the semi major axis and period of the orbit 
C) the radial velocities of the two stars 
D) the time required for the small star to eclipse the larger star 
A) the ratio of the angular separation from the centre of mass of each of the stars 
B) the semi major axis and period of the orbit 
C) the radial velocities of the two stars 
D) the time required for the small star to eclipse the larger star

Question 4

Which of the following is a characteristic of an eclipsing binary?

Accepted Answer

A) It will be more luminous than a visual binary. 
B) It will also be observed as a spectroscopic binary. 
C) It will show a constant Doppler shift in its spectral lines. 
D) It will show two stars with variable proper motion. 
A) It will be more luminous than a visual binary. 
B) It will also be observed as a spectroscopic binary. 
C) It will show a constant Doppler shift in its spectral lines. 
D) It will show two stars with variable proper motion.

Question 5

When compared to stars near the middle of the diagram,how are stars in the upper right part of the Hertzsprung-Russell diagram different?

Accepted Answer

A) They are always cooler. 
B) They are always larger. 
C) They are always smaller. 
D) They are always more massive. 
A) They are always cooler. 
B) They are always larger. 
C) They are always smaller. 
D) They are always more massive.

Question 6

Which of the following kinds of stars is most dense?

Accepted Answer

A) a supergiant star 
B) a main-sequence star 
C) a giant star 
D) a white dwarf 
A) a supergiant star 
B) a main-sequence star 
C) a giant star 
D) a white dwarf

Question 7

Where are red giant stars found in the H-R diagram?

Accepted Answer

A) above the main sequence 
B) below the main sequence 
C) on the lower main sequence 
D) on the upper main sequence 
A) above the main sequence 
B) below the main sequence 
C) on the lower main sequence 
D) on the upper main sequence

Question 8

Compared with the spectral lines in the solar spectrum,how are lines in a supergiant star's spectrum different?

Accepted Answer

A) They are narrower. 
B) They are broader. 
C) They are weaker. 
D) They are stronger. 
A) They are narrower. 
B) They are broader. 
C) They are weaker. 
D) They are stronger.

Question 9

The largest of the red stars are the ____________________ stars.

Accepted Answer

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

Question 10

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

Accepted Answer

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

What is the most reliable way to measure the mass of a star for which the distance is unknown?

Luminosity class IV objects are known as ____________________.

Which of the following pieces of information are needed to calculate the total mass of a binary system?

Which of the following is a characteristic of an eclipsing binary?

When compared to stars near the middle of the diagram,how are stars in the upper right part of the Hertzsprung-Russell diagram different?

Which of the following kinds of stars is most dense?

Where are red giant stars found in the H-R diagram?

Compared with the spectral lines in the solar spectrum,how are lines in a supergiant star's spectrum different?

The largest of the red stars are the ____________________ stars.

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

The Scale of the Cosmos

User's Guide to the Sky

The Origin of Modern Astronomy

Astronomical Telescopes and Instruments

Sun Light and Sun Atoms

The Structure and Formation of Stars

The Deaths of Stars

The Milky Way Galaxy

Galaxies

Cosmology in the 21st Century

The Origin of the Solar System

Comparative Planetology of the Terrestrial Planets

Comparative Planetology of the Jovian Planets

Life on Other Worlds

Filters

Exam 6: The Family of Stars

What is the most reliable way to measure the mass of a star for which the distance is unknown?

Luminosity class IV objects are known as ____________________.

Which of the following pieces of information are needed to calculate the total mass of a binary system?

Which of the following is a characteristic of an eclipsing binary?

When compared to stars near the middle of the diagram,how are stars in the upper right part of the Hertzsprung-Russell diagram different?

Which of the following kinds of stars is most dense?

Where are red giant stars found in the H-R diagram?

Compared with the spectral lines in the solar spectrum,how are lines in a supergiant star's spectrum different?

The largest of the red stars are the ____________________ stars.

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

The Scale of the Cosmos

User's Guide to the Sky

The Origin of Modern Astronomy

Astronomical Telescopes and Instruments

Sun Light and Sun Atoms

The Structure and Formation of Stars

The Deaths of Stars

The Milky Way Galaxy

Galaxies

Cosmology in the 21st Century

The Origin of the Solar System

Comparative Planetology of the Terrestrial Planets

Comparative Planetology of the Jovian Planets

Life on Other Worlds

Filters