Question 1

Absolute visual magnitude is

Accepted Answer

A) the apparent magnitude of a star observed from Earth. 
B) the luminosity of a star observed from a distance of 1000 pc. 
C) the apparent magnitude of a star observed from a distance of 10 pc. 
D) the luminosity of a star observed from Earth. 
E) the apparent magnitude of a star observed from a distance of 10 pc and the luminosity of a star observed from Earth. 
A) the apparent magnitude of a star observed from Earth. 
B) the luminosity of a star observed from a distance of 1000 pc. 
C) the apparent magnitude of a star observed from a distance of 10 pc. 
D) the luminosity of a star observed from Earth. 
E) the apparent magnitude of a star observed from a distance of 10 pc and the luminosity of a star observed from Earth.

Question 2

Which statement is incorrect about the above spectra

Accepted Answer

A) Hα line strength increases with decreasing stellar surface temperature from 05 to about F0 and decreases in line strength with decreasing stellar surface temperature from about F0 to M0. 
B) Hβ line strength increases with decreasing stellar surface temperature from 05 to about A1 and decreases in line strength with decreasing stellar surface temperature from about A1 to K0. 
C) Hγ line strength increases with decreasing stellar surface temperature from 05 to about K0 and decreases in line strength with decreasing stellar surface temperature from about K0 to M5. 
D) Hδ line strength increases with decreasing stellar surface temperature from 05 to about A1 and decreases in line strength with decreasing stellar surface temperature from about A1 to K0. 
A) Hα line strength increases with decreasing stellar surface temperature from 05 to about F0 and decreases in line strength with decreasing stellar surface temperature from about F0 to M0. 
B) Hβ line strength increases with decreasing stellar surface temperature from 05 to about A1 and decreases in line strength with decreasing stellar surface temperature from about A1 to K0. 
C) Hγ line strength increases with decreasing stellar surface temperature from 05 to about K0 and decreases in line strength with decreasing stellar surface temperature from about K0 to M5. 
D) Hδ line strength increases with decreasing stellar surface temperature from 05 to about A1 and decreases in line strength with decreasing stellar surface temperature from about A1 to K0.

Question 3

How do absolute visual magnitude and luminosity differ

Accepted Answer

Absolute visual magnitude of a star is t

Question 4

We know that the numbers of stars _________ from _______ to ________ on the H-R diagram.

Accepted Answer

A) increases, upper right, lower left 
B) decreases, upper left, lower right 
C) increases, upper left, lower right 
D) decreases, upper right, lower left 
A) increases, upper right, lower left 
B) decreases, upper left, lower right 
C) increases, upper left, lower right 
D) decreases, upper right, lower left

Question 5

If a star is located at 10 pc, which of the following statements is correct

Accepted Answer

A) The star's apparent and absolute visual magnitudes are equal. 
B) The star's apparent and absolute visual magnitudes are 0. 
C) The star's apparent visual magnitude is -1.1 whereas the absolute visual magnitude is -5. 
D) Two of the other choices are correct. 
A) The star's apparent and absolute visual magnitudes are equal. 
B) The star's apparent and absolute visual magnitudes are 0. 
C) The star's apparent visual magnitude is -1.1 whereas the absolute visual magnitude is -5. 
D) Two of the other choices are correct.

Question 6

For what kinds of stars are the masses of stars in the H-R diagram "orderly" For what kinds of stars are they disorderly In other words, could you guess the mass of a star from its location (luminosity, temperature) on the H-R diagram

Accepted Answer

The masses of main-sequence st

Question 7

What is the correct order of densities from least to most

Accepted Answer

A) supergiant, main sequence, white dwarf 
B) main sequence, white dwarf, supergiant 
C) white dwarf, main sequence, giant 
D) main sequence, giant, supergiant 
A) supergiant, main sequence, white dwarf 
B) main sequence, white dwarf, supergiant 
C) white dwarf, main sequence, giant 
D) main sequence, giant, supergiant

Question 8

The diagram below illustrates two stars in a visual binary system and the center of mass of this system. Based on this diagram, what is the ratio of the mass of star A to the mass of star B

Accepted Answer

A) 2 to 1 
B) 1 to 2 
C) 2 to 3 
D) 3 to 2 
E) 1 to 3 
A) 2 to 1 
B) 1 to 2 
C) 2 to 3 
D) 3 to 2 
E) 1 to 3

Question 9

Arcturus has an mV = -0.04 and MV = -0.3. Its distance is 10-3.4 pc.

Accepted Answer

A) True 
 B)False

Question 10

Proxima Centauri has an absolute visual magnitude of 15.5 and an apparent visual magnitude of 11.0. What is the distance to Proxima Centauri in units of pc

Accepted Answer

A) 0.1 
B) 100.1 
C) 10-0.1 
D) None of the other choices are correct. 
A) 0.1 
B) 100.1 
C) 10-0.1 
D) None of the other choices are correct.

Question 11

We know the white dwarf star Sirius B has a mass comparable to the Sun because

Accepted Answer

A) of its measured color. 
B) of its measured temperature compared to Sirius A. 
C) it is part of binary star system with Sirius A. 
A) of its measured color. 
B) of its measured temperature compared to Sirius A. 
C) it is part of binary star system with Sirius A.

Question 12

Some giants and/or supergiants are less dense than air.

Accepted Answer

A) True 
 B)False

Question 13

Parallax would be easier to measure if

Accepted Answer

A) Earth's orbit was larger. 
B) the stars were farther away. 
C) Earth moved faster along its orbit. 
D) Earth's orbit was larger, the stars were further away, and Earth moved faster along its orbit. 
E) None of the other choices are correct. 
A) Earth's orbit was larger. 
B) the stars were farther away. 
C) Earth moved faster along its orbit. 
D) Earth's orbit was larger, the stars were further away, and Earth moved faster along its orbit. 
E) None of the other choices are correct.

Question 14

Main-sequence stars have about the same density as the Sun but giant stars have very low densities.

Accepted Answer

A) True 
 B)False

Question 15

A star's apparent magnitude is a measure of

Accepted Answer

A) how bright it appears to us if it is at its actual distance. 
B) how bright it appears to us at a standard distance of 10 pc. 
C) its energy output per second compared to the Sun. 
D) its mass in solar masses. 
E) its surface temperature in Kelvin. 
A) how bright it appears to us if it is at its actual distance. 
B) how bright it appears to us at a standard distance of 10 pc. 
C) its energy output per second compared to the Sun. 
D) its mass in solar masses. 
E) its surface temperature in Kelvin.

Question 16

A star's luminosity depends only on the star's

Accepted Answer

A) distance and diameter. 
B) temperature and distance. 
C) distance. 
D) temperature and diameter. 
E) apparent magnitude. 
A) distance and diameter. 
B) temperature and distance. 
C) distance. 
D) temperature and diameter. 
E) apparent magnitude.

Question 17

How do the spectra of giants, supergiants, and main-sequence stars differ

Accepted Answer

Supergiants have very narrow s

Question 18

Why don't we see hydrogen Balmer lines in the spectra of stars with temperatures of 3,200 K

Accepted Answer

A) There is no hydrogen in stars this cool. 
B) The stars are hot enough that most of the hydrogen is ionized and the atoms cannot absorb energy. 
C) These stars are so cool that nearly all of the hydrogen atoms are in the ground state. 
D) Stars of this temperature are too cool to produce an absorption spectrum. 
E) Stars of this temperature are too hot to produce an absorption spectrum. 
A) There is no hydrogen in stars this cool. 
B) The stars are hot enough that most of the hydrogen is ionized and the atoms cannot absorb energy. 
C) These stars are so cool that nearly all of the hydrogen atoms are in the ground state. 
D) Stars of this temperature are too cool to produce an absorption spectrum. 
E) Stars of this temperature are too hot to produce an absorption spectrum.

Question 19

The best sample of the true numbers of the different types of stars consists of

Accepted Answer

A) stars that appear brightest in the sky to an observer on Earth. 
B) all of the stars within our solar system. 
C) all the stars within a given distance from Earth. 
A) stars that appear brightest in the sky to an observer on Earth. 
B) all of the stars within our solar system. 
C) all the stars within a given distance from Earth.

Question 20

The method of spectroscopic parallax cannot be applied to stars beyond about 100 pc.

Accepted Answer

A) True 
 B)False

Absolute visual magnitude is

Which statement is incorrect about the above spectra

How do absolute visual magnitude and luminosity differ

We know that the numbers of stars _____ from _ to ______ on the H-R diagram.

If a star is located at 10 pc, which of the following statements is correct

For what kinds of stars are the masses of stars in the H-R diagram "orderly" For what kinds of stars are they disorderly In other words, could you guess the mass of a star from its location (luminosity, temperature) on the H-R diagram

What is the correct order of densities from least to most

The diagram below illustrates two stars in a visual binary system and the center of mass of this system. Based on this diagram, what is the ratio of the mass of star A to the mass of star B

Arcturus has an mV = -0.04 and MV = -0.3. Its distance is 10-3.4 pc.

Proxima Centauri has an absolute visual magnitude of 15.5 and an apparent visual magnitude of 11.0. What is the distance to Proxima Centauri in units of pc

We know the white dwarf star Sirius B has a mass comparable to the Sun because

Some giants and/or supergiants are less dense than air.

Parallax would be easier to measure if

Main-sequence stars have about the same density as the Sun but giant stars have very low densities.

A star's apparent magnitude is a measure of

A star's luminosity depends only on the star's

How do the spectra of giants, supergiants, and main-sequence stars differ

Why don't we see hydrogen Balmer lines in the spectra of stars with temperatures of 3,200 K

The best sample of the true numbers of the different types of stars consists of

The method of spectroscopic parallax cannot be applied to stars beyond about 100 pc.

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

Exam 8: The Family of Stars

Absolute visual magnitude is

Which statement is incorrect about the above spectra

How do absolute visual magnitude and luminosity differ

We know that the numbers of stars _________ from _______ to ________ on the H-R diagram.

If a star is located at 10 pc, which of the following statements is correct

For what kinds of stars are the masses of stars in the H-R diagram "orderly" For what kinds of stars are they disorderly In other words, could you guess the mass of a star from its location (luminosity, temperature) on the H-R diagram

What is the correct order of densities from least to most

The diagram below illustrates two stars in a visual binary system and the center of mass of this system. Based on this diagram, what is the ratio of the mass of star A to the mass of star B

Arcturus has an mV = -0.04 and MV = -0.3. Its distance is 10-3.4 pc.

Proxima Centauri has an absolute visual magnitude of 15.5 and an apparent visual magnitude of 11.0. What is the distance to Proxima Centauri in units of pc

We know the white dwarf star Sirius B has a mass comparable to the Sun because

Some giants and/or supergiants are less dense than air.

Parallax would be easier to measure if

Main-sequence stars have about the same density as the Sun but giant stars have very low densities.

A star's apparent magnitude is a measure of

A star's luminosity depends only on the star's

How do the spectra of giants, supergiants, and main-sequence stars differ

Why don't we see hydrogen Balmer lines in the spectra of stars with temperatures of 3,200 K

The best sample of the true numbers of the different types of stars consists of

The method of spectroscopic parallax cannot be applied to stars beyond about 100 pc.

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

We know that the numbers of stars _____ from _ to ______ on the H-R diagram.