Question 1

What is proper motion? How is it related to transverse velocity?

Accepted Answer

Annual apparent motion of a st

Question 2

From hottest to coolest,the seven letters for the star types are ________.

Accepted Answer

The answer of From hottest to coolest,the seven letters for...

Question 3

If a star were moved 10 times farther away,its apparent magnitude would drop by five magnitudes.

Accepted Answer

A) True 
 B)False

Question 4

In a spectroscopic binary system,the star showing the larger blue shift is:

Accepted Answer

A)  cooler and receding the fastest. 
B)  less massive of the pair and receding slower. 
C)  more massive and approaching us. 
D)  less massive and approaching us at this moment. 
E)  hotter and receding faster. 
A)  cooler and receding the fastest. 
B)  less massive of the pair and receding slower. 
C)  more massive and approaching us. 
D)  less massive and approaching us at this moment. 
E)  hotter and receding faster.

Question 5

Hydrogen lines are weaker in both very hot and very cool stars.

Accepted Answer

A) True 
 B)False

Question 6

Star A and star B both have an absolute magnitude of 2.0,but star A is at a distance of 50 pc and star B is at a distance of 20 pc.Which statement below is correct?

Accepted Answer

A)  Star A appears brighter than star B, but actually star B and star A are the same brightness. 
B)  Star B appears brighter than star A, but actually star B and star A are the same brightness. 
C)  Star A and star B appear to have the same brightness, but actually star B is brighter than star A. 
D)  Star A and star B appear to have the same brightness, but actually star A is brighter than star B. 
E)  It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above. 
A)  Star A appears brighter than star B, but actually star B and star A are the same brightness. 
B)  Star B appears brighter than star A, but actually star B and star A are the same brightness. 
C)  Star A and star B appear to have the same brightness, but actually star B is brighter than star A. 
D)  Star A and star B appear to have the same brightness, but actually star A is brighter than star B. 
E)  It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above.

Question 7

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

Accepted Answer

A) True 
 B)False

Question 8

About how many stars has the Hipparcos mission given us accurate distance data on?

Accepted Answer

A)  about 3,000, about half of what you can see with the naked eye alone 
B)  over 6000, the visible naked eye stars and some seen in binoculars 
C)  60,000, those within about 100 light years of us 
D)  a million, those with parallaxes of .005" or larger 
E)  over 100 billion, almost every star in the galaxy 
A)  about 3,000, about half of what you can see with the naked eye alone 
B)  over 6000, the visible naked eye stars and some seen in binoculars 
C)  60,000, those within about 100 light years of us 
D)  a million, those with parallaxes of .005" or larger 
E)  over 100 billion, almost every star in the galaxy

Question 9

What is the single most important characteristic in determining the course of a star's evolution?

Accepted Answer

A)  density 
B)  absolute brightness 
C)  distance 
D)  surface temperature 
E)  mass 
A)  density 
B)  absolute brightness 
C)  distance 
D)  surface temperature 
E)  mass

Question 10

In a spectroscopic binary,if a pair shows a combined set of lines tonight,but a maximum split two nights later,its orbital period must be:

Accepted Answer

A)  one day. 
B)  two days. 
C)  four days. 
D)  eight days. 
E)  twelve days. 
A)  one day. 
B)  two days. 
C)  four days. 
D)  eight days. 
E)  twelve days.

Question 11

Star A and star B both have an apparent magnitude of 4.0,but star A has an absolute magnitude of 1.0 and star B has an absolute magnitude of 7.0.Which statement below is correct?

Accepted Answer

A)  Star A appears brighter than star B, but actually star B and star A are the same brightness. 
B)  Star B appears brighter than star A, but actually star B and star A are the same brightness. 
C)  Star A and star B appear to have the same brightness, but actually star B is brighter than star A. 
D)  Star A and star B appear to have the same brightness, but actually star A is brighter than star B. 
E)  It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above. 
A)  Star A appears brighter than star B, but actually star B and star A are the same brightness. 
B)  Star B appears brighter than star A, but actually star B and star A are the same brightness. 
C)  Star A and star B appear to have the same brightness, but actually star B is brighter than star A. 
D)  Star A and star B appear to have the same brightness, but actually star A is brighter than star B. 
E)  It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above.

Question 12

All classes of binary stars yield the basic information on stellar ________.

Accepted Answer

The answer of All classes of binary stars yield the...

Question 13

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 14

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 15

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

Question 16

Two stars have apparent magnitudes of 0 and 5.If both stars are 117 parsecs away,which star is intrinsically brighter and by what factor is it brighter than the other?

Accepted Answer

Since both stars are at the same distanc

Question 17

In what range of masses are most stars found?

Accepted Answer

A)  0.1 to 2 solar masses 
B)  1 to 3 solar masses 
C)  0.1 to 100 solar masses 
D)  0.01 to 100 solar masses 
E)  Stars can have any mass. 
A)  0.1 to 2 solar masses 
B)  1 to 3 solar masses 
C)  0.1 to 100 solar masses 
D)  0.01 to 100 solar masses 
E)  Stars can have any mass.

Question 18

Contrast main sequence stars of type B and G.

Accepted Answer

The B star will be h

Question 19

If two stars are the same size and one is twice the temperature of the other,how much more luminous is the hotter one?

Accepted Answer

The answer of If two stars are the same size...

Question 20

Stars of the main sequence all fall in luminosity class ________.

Accepted Answer

The answer of Stars of the main sequence all fall...

Exam 17: The Stars: Giants,Dwarfs,and the Main Sequence

What is proper motion? How is it related to transverse velocity?

From hottest to coolest,the seven letters for the star types are ________.

If a star were moved 10 times farther away,its apparent magnitude would drop by five magnitudes.

In a spectroscopic binary system,the star showing the larger blue shift is:

Hydrogen lines are weaker in both very hot and very cool stars.

Star A and star B both have an absolute magnitude of 2.0,but star A is at a distance of 50 pc and star B is at a distance of 20 pc.Which statement below is correct?

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

About how many stars has the Hipparcos mission given us accurate distance data on?

What is the single most important characteristic in determining the course of a star's evolution?

In a spectroscopic binary,if a pair shows a combined set of lines tonight,but a maximum split two nights later,its orbital period must be:

Star A and star B both have an apparent magnitude of 4.0,but star A has an absolute magnitude of 1.0 and star B has an absolute magnitude of 7.0.Which statement below is correct?

All classes of binary stars yield the basic information on stellar ________.

What are the two most important intrinsic properties used to classify 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.

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?

Two stars have apparent magnitudes of 0 and 5.If both stars are 117 parsecs away,which star is intrinsically brighter and by what factor is it brighter than the other?

In what range of masses are most stars found?

Contrast main sequence stars of type B and G.

If two stars are the same size and one is twice the temperature of the other,how much more luminous is the hotter one?

Stars of the main sequence all fall in luminosity class ________.

Charting the Heavens: The Foundations of Astronomy

The Copernican Revolution: The Birth of Modern Science

Radiation: Information from the Cosmos

Spectroscopy: The Inner Workings of Atoms

Telescopes: The Tools of Astronomy

The Solar System: Comparative Planetology and Formation Models

Earth: Our Home in Space

The Moon and Mercury: Scorched and Battered Worlds

Venus: Earth's Sister Planet

Mars: A Near Miss for Life?

Jupiter: Giant of the Solar System

Saturn: Spectacular Rings and Mysterious Moons

Uranus and Neptune: The Outer Worlds of the Solar System

Solar System Debris: Keys to Our Origin

Exoplanets: Planetary Systems Beyond Our Own

The Sun: Our Parent Star

The Interstellar Medium: Gas and Dust among the Stars

Star Formation: A Traumatic Birth

Stellar Evolution: The Life and Death of a Star

Stellar Explosions: Novae,Supernovae,and the Formation of the Elements

Neutron Stars and Black Holes: Strange States of Matter

The Milky Way Galaxy: A Spiral in Space

Galaxies: Building Blocks of the Universe

Galaxies and Dark Matter: The Large-Scale Structure of the Cosmos

Cosmology: The Big Bang and the Fate of the Universe

The Early Universe: Toward the Beginning of Time

Life in the Universe: Are We Alone?

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