Question 1

Star A and star B have the same apparent magnitude. Star A is twice as distant as star B. Therefore, star A has twice the luminosity as star B.

Accepted Answer

A) True 
 B)False

Question 2

On the H-R diagram, the Sun lies

Accepted Answer

A)  at the top left. 
B)  at the bottom left. 
C)  at the bottom right. 
D)  about the middle of the main sequence. 
E)  at the top right. 
A)  at the top left. 
B)  at the bottom left. 
C)  at the bottom right. 
D)  about the middle of the main sequence. 
E)  at the top right.

Question 3

Which statement about stellar motion is incorrect?

Accepted Answer

A)  In general, the closer a star is, the more its proper motion. 
B)  The radial velocity is measured by the Doppler shift. 
C)  The transverse velocity is measured by the proper motion and the distance. 
D)  Like parallax, proper motion is measured over intervals of exactly six months. 
E)  The Pythagorean theorem relates space, transverse, and radial velocities. 
A)  In general, the closer a star is, the more its proper motion. 
B)  The radial velocity is measured by the Doppler shift. 
C)  The transverse velocity is measured by the proper motion and the distance. 
D)  Like parallax, proper motion is measured over intervals of exactly six months. 
E)  The Pythagorean theorem relates space, transverse, and radial velocities.

Question 4

In an eclipsing binary, the longer the stages of the eclipse take, the ________ the star.

Accepted Answer

The answer of In an eclipsing binary, the longer the...

Question 5

Perhaps the greatest of the Greek astronomers, ________ compiled the first catalog of stars, accurately measured their positions, and defined the basic system of stellar brightnesses.

Accepted Answer

A)  Erastothenes 
B)  Aristotle 
C)  Ptolemy 
D)  Hipparchus 
E)  Aristarchus 
A)  Erastothenes 
B)  Aristotle 
C)  Ptolemy 
D)  Hipparchus 
E)  Aristarchus

Question 6

Contrast main sequence stars of type B and G.

Accepted Answer

The B star will be h

Question 7

Why must both parallax and proper motion be known to give transverse velocity?

Accepted Answer

To turn the star's apparent mo

Question 8

A type B9 star is hotter than a type A0.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following is the most common type of star?

Accepted Answer

A)  High mass main sequence 
B)  Low mass main sequence 
C)  White dwarfs 
D)  Red giants 
E)  Blue supergiants 
A)  High mass main sequence 
B)  Low mass main sequence 
C)  White dwarfs 
D)  Red giants 
E)  Blue supergiants

Question 10

What role does hydrogen play in spectral classification?

Accepted Answer

Its spectral lines are most ob

Question 11

In a visual binary system with circular orbits, if in 20 years the two stars' position angles have shifted by 30 degrees, the pair's period must be

Accepted Answer

A)  60 years. 
B)  90 years. 
C)  120 years. 
D)  240 years. 
E)  360 years. 
A)  60 years. 
B)  90 years. 
C)  120 years. 
D)  240 years. 
E)  360 years.

Question 12

What are the two most important intrinsic properties used to classify stars?

Accepted Answer

A)  Mass and age 
B)  Luminosity and surface temperature 
C)  Distance and luminosity 
D)  Distance and surface temperature 
E)  Distance and color 
A)  Mass and age 
B)  Luminosity and surface temperature 
C)  Distance and luminosity 
D)  Distance and surface temperature 
E)  Distance and color

Question 13

Compared to the size of the Sun, in what range of sizes are nearly all stars found?

Accepted Answer

A)  0.5 to 2 solar radii 
B)  0.1 to 1.0 solar radii 
C)  0.5 to 50 solar radii 
D)  1 to 100 solar radii 
E)  0.01 to 100 solar radii 
A)  0.5 to 2 solar radii 
B)  0.1 to 1.0 solar radii 
C)  0.5 to 50 solar radii 
D)  1 to 100 solar radii 
E)  0.01 to 100 solar radii

Question 14

The apparent magnitude of the Sun is -26, while Sirius has an apparent magnitude of -1; how much brighter does the Sun appear than Sirius?

Accepted Answer

This is a difference of 25 mag

Question 15

Eclipsing binaries are the most useful, giving us sizes as well as masses of the pair.

Accepted Answer

A) True 
 B)False

Question 16

What is proper motion?

Accepted Answer

A)  It is the true, not apparent, motion of a star in space. 
B)  It is the apparent shift as we go to opposite sides of our orbit every six months. 
C)  It is the annual apparent motion of a star across the sky. 
D)  It is the motion of a star towards or away from us, revealed by Doppler shifts. 
E)  It is the orbital motion of a star around the Galaxy. 
A)  It is the true, not apparent, motion of a star in space. 
B)  It is the apparent shift as we go to opposite sides of our orbit every six months. 
C)  It is the annual apparent motion of a star across the sky. 
D)  It is the motion of a star towards or away from us, revealed by Doppler shifts. 
E)  It is the orbital motion of a star around the Galaxy.

Question 17

Which type of binary can have their sizes measured directly by photometry?

Accepted Answer

A)  Virtual 
B)  Visual 
C)  Eclipsing 
D)  Spectroscopic 
E)  Astrometric 
A)  Virtual 
B)  Visual 
C)  Eclipsing 
D)  Spectroscopic 
E)  Astrometric

Question 18

A star of the Sun's diameter, but twice as hot, must be 16X more luminous than the Sun.

Accepted Answer

A) True 
 B)False

Question 19

The proper motion of a star, its distance, and Doppler shift can give us its space velocity.

Accepted Answer

A) True 
 B)False

Question 20

How is distance determined to the nearest stars? How far out can this technique be applied? How many stars can be measured in this way?

Accepted Answer

The distance to the nearest stars is mea

Star A and star B have the same apparent magnitude. Star A is twice as distant as star B. Therefore, star A has twice the luminosity as star B.

On the H-R diagram, the Sun lies

Which statement about stellar motion is incorrect?

In an eclipsing binary, the longer the stages of the eclipse take, the ________ the star.

Perhaps the greatest of the Greek astronomers, ________ compiled the first catalog of stars, accurately measured their positions, and defined the basic system of stellar brightnesses.

Contrast main sequence stars of type B and G.

Why must both parallax and proper motion be known to give transverse velocity?

A type B9 star is hotter than a type A0.

Which of the following is the most common type of star?

What role does hydrogen play in spectral classification?

In a visual binary system with circular orbits, if in 20 years the two stars' position angles have shifted by 30 degrees, the pair's period must be

What are the two most important intrinsic properties used to classify stars?

Compared to the size of the Sun, in what range of sizes are nearly all stars found?

The apparent magnitude of the Sun is -26, while Sirius has an apparent magnitude of -1; how much brighter does the Sun appear than Sirius?

Eclipsing binaries are the most useful, giving us sizes as well as masses of the pair.

What is proper motion?

Which type of binary can have their sizes measured directly by photometry?

A star of the Sun's diameter, but twice as hot, must be 16X more luminous than the Sun.

The proper motion of a star, its distance, and Doppler shift can give us its space velocity.

How is distance determined to the nearest stars? How far out can this technique be applied? How many stars can be measured in this way?

The Night Sky

Light and Telescopes

The Solar System

Earth and Its Moon

The Eight Planets

Small Bodies in the Solar System

Formation of Planetary Systems

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Cosmology and the Universe

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Exam 9: Measuring the Stars

Star A and star B have the same apparent magnitude. Star A is twice as distant as star B. Therefore, star A has twice the luminosity as star B.

On the H-R diagram, the Sun lies

Which statement about stellar motion is incorrect?

In an eclipsing binary, the longer the stages of the eclipse take, the ________ the star.

Perhaps the greatest of the Greek astronomers, ________ compiled the first catalog of stars, accurately measured their positions, and defined the basic system of stellar brightnesses.

Contrast main sequence stars of type B and G.

Why must both parallax and proper motion be known to give transverse velocity?

A type B9 star is hotter than a type A0.

Which of the following is the most common type of star?

What role does hydrogen play in spectral classification?

In a visual binary system with circular orbits, if in 20 years the two stars' position angles have shifted by 30 degrees, the pair's period must be

What are the two most important intrinsic properties used to classify stars?

Compared to the size of the Sun, in what range of sizes are nearly all stars found?

The apparent magnitude of the Sun is -26, while Sirius has an apparent magnitude of -1; how much brighter does the Sun appear than Sirius?

Eclipsing binaries are the most useful, giving us sizes as well as masses of the pair.

What is proper motion?

Which type of binary can have their sizes measured directly by photometry?

A star of the Sun's diameter, but twice as hot, must be 16X more luminous than the Sun.

The proper motion of a star, its distance, and Doppler shift can give us its space velocity.

How is distance determined to the nearest stars? How far out can this technique be applied? How many stars can be measured in this way?

The Night Sky

Light and Telescopes

The Solar System

Earth and Its Moon

The Eight Planets

Small Bodies in the Solar System

Formation of Planetary Systems

The Sun

Star Formation and Evolution

Stellar Explosions

Black Holes

The Milky Way Galaxy

Galaxies

Cosmology and the Universe

Filters