Question 1

In the H-R diagram, the bright blue-white stars that dominate the naked eye sky lie to the:

Accepted Answer

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

Question 2

The ESA's GAIA project will be able to measure parallax and stellar properties of about howmany stars?

Accepted Answer

A) one million 
B) ten thousand 
C) one billion 
D) one hundred billion 
E) None; it has a different purpose. 
A) one million 
B) ten thousand 
C) one billion 
D) one hundred billion 
E) None; it has a different purpose.

Question 3

In a spectroscopic binary system, the star showing the larger blueshift 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 4

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

Accepted Answer

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

Question 5

Star A and star B both have an absolute magnitude of 2.0, but star A has an apparentmagnitude of 5.0 and star B has an apparent 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 starA. 
D) Star A and star B appear to have the same brightness, but actually star A is brighter than starB. 
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 starA. 
D) Star A and star B appear to have the same brightness, but actually star A is brighter than starB. 
E) It is impossible to determine how bright these stars are or appear to be relative to one another,given the information above.

Question 6

In comparing first magnitude Deneb with second magnitude Polaris, we find that:

Accepted Answer

A) Polaris is in reality much more luminous. 
B) Deneb must be much hotter than Polaris. 
C) Deneb appears 2.5 times brighter to us than does Polaris. 
D) Polaris is really 100 times brighter than nearby Deneb. 
E) Deneb is really much closer than Polaris. 
A) Polaris is in reality much more luminous. 
B) Deneb must be much hotter than Polaris. 
C) Deneb appears 2.5 times brighter to us than does Polaris. 
D) Polaris is really 100 times brighter than nearby Deneb. 
E) Deneb is really much closer than Polaris.

Question 7

How is proper motion measured?

Accepted Answer

It is the apparent motion of t

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

If a star appears to move back and forth relative to other stars over a six-month period, thismotion is due to the star's:

Accepted Answer

A) transverse motion. 
B) radial motion. 
C) parallax shift. 
D) Doppler shift. 
E) true space motion. 
A) transverse motion. 
B) radial motion. 
C) parallax shift. 
D) Doppler shift. 
E) true space motion.

Question 10

In a spectroscopic binary, the star whose lines shift the most weighs the most.

Accepted Answer

A) True 
 B)False

Question 11

The most famous G type star is:

Accepted Answer

A) Polaris. 
B) Betelguese. 
C) Sirius. 
D) the Sun. 
E) Pollux. 
A) Polaris. 
B) Betelguese. 
C) Sirius. 
D) the Sun. 
E) Pollux.

Question 12

High mass stars account for most of the ________ in large regions of star formation, such asgalaxies.

Accepted Answer

A) mass 
B) stars 
C) planetary nebulae 
D) light 
A) mass 
B) stars 
C) planetary nebulae 
D) light

Question 13

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

Accepted Answer

A) .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) .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

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 15

The absolute magnitude of a star is its brightness as seen from a distance of:

Accepted Answer

A) one million kilometers. 
B) one astronomical unit. 
C) one light-year. 
D) ten parsecs. 
E) 10 light-years. 
A) one million kilometers. 
B) one astronomical unit. 
C) one light-year. 
D) ten parsecs. 
E) 10 light-years.

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

What is the typical main sequence lifetime of a B-type star?

Accepted Answer

A) less than a million years 
B) 20 million years 
C) 100 million years 
D) 1 billion years 
E) 10 billion years 
A) less than a million years 
B) 20 million years 
C) 100 million years 
D) 1 billion years 
E) 10 billion years

Question 18

The ________ magnitude of a star depends directly upon its luminosity and distance.

Accepted Answer

The answer of The ________ magnitude of a star depends...

Question 19

The vast majority of stars near us would fall to the bottom right on the H-R diagram.

Accepted Answer

A) True 
 B)False

Question 20

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

Accepted Answer

To turn the star's apparent mo

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

In the H-R diagram, the bright blue-white stars that dominate the naked eye sky lie to the:

The ESA's GAIA project will be able to measure parallax and stellar properties of about howmany stars?

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

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

Star A and star B both have an absolute magnitude of 2.0, but star A has an apparentmagnitude of 5.0 and star B has an apparent magnitude of 7.0. Which statement below is correct?

In comparing first magnitude Deneb with second magnitude Polaris, we find that:

How is proper motion measured?

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

If a star appears to move back and forth relative to other stars over a six-month period, thismotion is due to the star's:

In a spectroscopic binary, the star whose lines shift the most weighs the most.

The most famous G type star is:

High mass stars account for most of the ________ in large regions of star formation, such asgalaxies.

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

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

The absolute magnitude of a star is its brightness as seen from a distance of:

What is proper motion?

What is the typical main sequence lifetime of a B-type star?

The ________ magnitude of a star depends directly upon its luminosity and distance.

The vast majority of stars near us would fall to the bottom right on the H-R diagram.

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

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: Earths 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

Filters