Question 1

Acrux has an M V = -4.2 and an m V = 0.81. Therefore, Acrux is actually brighter than we perceive it to be.

Accepted Answer

A) True 
 B)False

Question 2

Which statement is incorrect about the above spectra?

Accepted Answer

A)  H α  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)  H β  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)  H γ  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)  H δ  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)  H α  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)  H β  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)  H γ  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)  H δ  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

As shown in the above spectra, which is taken at two different times, a ________ is concluded.

Accepted Answer

A)  visual binary 
B)  eclipsing binary 
C)  spectroscopic binary 
D)  single star 
A)  visual binary 
B)  eclipsing binary 
C)  spectroscopic binary 
D)  single star

Question 4

A parsec is
I. a unit of length used in astronomy
II. 2.06 × 105 AU
III. the distance to an imaginary star whose stellar parallax is one arc second
IV. 3.26 light years
V. the longest unit of length in astronomy

Accepted Answer

A)  I, II, V 
B)  II, IV 
C)  I, III, IV, V 
D)  I, II, III, IV, IV 
A)  I, II, V 
B)  II, IV 
C)  I, III, IV, V 
D)  I, II, III, IV, IV

Question 5

An eclipsing binary has been analyzed and it has been determined that the ratio of the mass of star A to the mass of star B is 6 and the total mass of the two stars is 26 solar masses. What are the masses of star A and star B?

Accepted Answer

A)  Star A has a mass of 1 solar mass and star B has a mass of 6 solar masses. 
B)  Star A has a mass of 20 solar mass and star B has a mass of 6 solar masses. 
C)  Star A has a mass of 31.2 solar mass and star B has a mass of 5.2 solar masses. 
D)  Star A has a mass of 22.3 solar mass and star B has a mass of 3.7 solar masses. 
E)  The masses of star A and star B cannot be determined from the information given. 
A)  Star A has a mass of 1 solar mass and star B has a mass of 6 solar masses. 
B)  Star A has a mass of 20 solar mass and star B has a mass of 6 solar masses. 
C)  Star A has a mass of 31.2 solar mass and star B has a mass of 5.2 solar masses. 
D)  Star A has a mass of 22.3 solar mass and star B has a mass of 3.7 solar masses. 
E)  The masses of star A and star B cannot be determined from the information given.

Question 6

Doppler-shift observations of a spectroscopic binary star can enable astronomers to calculate ________ of its individual stars.

Accepted Answer

A)  the minimum masses 
B)  the sizes 
C)  both minimum masses and sizes 
D)  neither minimum masses nor sizes 
A)  the minimum masses 
B)  the sizes 
C)  both minimum masses and sizes 
D)  neither minimum masses nor sizes

Question 7

Diagram 8-1 Use the H-R diagram below to answer the following question(s).  
Which star in Diagram 8-1 is most like the Sun?

Accepted Answer

A)  Alnilam 
B)  Antares 
C)  Arcturus 
D)  HR 5337 
E)  Sirius B 
A)  Alnilam 
B)  Antares 
C)  Arcturus 
D)  HR 5337 
E)  Sirius B

Question 8

The absorption lines in the ultraviolet portion of the spectrum of a star that are produced by hydrogen are from the

Accepted Answer

A)  Lyman series. 
B)  Balmer series. 
C)  Paschen series. 
D)  isotopes of hydrogen. 
E)  ions of hydrogen. 
A)  Lyman series. 
B)  Balmer series. 
C)  Paschen series. 
D)  isotopes of hydrogen. 
E)  ions of hydrogen.

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

-Table 8-1 Use the chart below to answer the following question(s)
From the data given, which star in Table 8-1 would appear the faintest in the night sky?

Accepted Answer

A)  65 Tau 
B)  HR 4621 
C)  α Pic 
D)  58 Ori 
E)  HR 2491 
A)  65 Tau 
B)  HR 4621 
C)  α Pic 
D)  58 Ori 
E)  HR 2491

Question 11

A G2 I star is ____________________ in diameter and ____________________ luminous than the Sun.

Accepted Answer

The answer of A G2 I star is ____________________ in...

Question 12

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 13

Polaris is 132 pc from Earth and has an absolute visual magnitude of -3.1. What is the apparent visual magnitude of this star?

Accepted Answer

A)  0.74 
B)  1.18 
C)  0.5 
D)  2.5 
A)  0.74 
B)  1.18 
C)  0.5 
D)  2.5

Question 14

The hydrogen lines in spectral type A stars

Accepted Answer

A)  are most narrow for supergiants. 
B)  are most narrow for main-sequence stars. 
C)  can not be used to estimate the luminosity of the star. 
D)  are very weak and difficult to see. 
E)  are useful in determining the apparent magnitude of the star. 
A)  are most narrow for supergiants. 
B)  are most narrow for main-sequence stars. 
C)  can not be used to estimate the luminosity of the star. 
D)  are very weak and difficult to see. 
E)  are useful in determining the apparent magnitude of the star.

Question 15

An 05 star has an H α  line present in its spectra. What color is the line?

Accepted Answer

A)  red 
B)  no color as the line is in the UV band 
C)  blue 
D)  no color as the line is in the infrared band 
A)  red 
B)  no color as the line is in the UV band 
C)  blue 
D)  no color as the line is in the infrared band

Question 16

White dwarfs have such a low luminosity that even the nearest white dwarfs are not visible to the naked eye.

Accepted Answer

A) True 
 B)False

Question 17

Which one of the methods below enables astronomers to measure the distance of a star near the Sun in our galaxy?

Accepted Answer

A)  sound echoes knowing the speed of sound and time 
B)  parallax using Earth's orbit 
C)  human binocular vision 
D)  Balmer series 
E)  none of the above 
A)  sound echoes knowing the speed of sound and time 
B)  parallax using Earth's orbit 
C)  human binocular vision 
D)  Balmer series 
E)  none of the above

Question 18

On the H-R diagram, cool and bright stars are located in the ________ corner.

Accepted Answer

A)  upper left 
B)  upper right 
C)  lower left 
D)  lower right 
A)  upper left 
B)  upper right 
C)  lower left 
D)  lower right

Question 19

The absolute magnitude of a star is the apparent magnitude it would have if it were 10 pc from Earth.

Accepted Answer

A) True 
 B)False

Question 20

What kind of spectra is shown in the color photographs above?

Accepted Answer

A)  emission 
B)  absorption 
C)  continuous 
D)  thermal 
A)  emission 
B)  absorption 
C)  continuous 
D)  thermal

Acrux has an M _V = -4.2 and an m _V = 0.81. Therefore, Acrux is actually brighter than we perceive it to be.

Which statement is incorrect about the above spectra?

As shown in the above spectra, which is taken at two different times, a ________ is concluded.

A parsec is I. a unit of length used in astronomy II. 2.06 × 10⁵ AU III. the distance to an imaginary star whose stellar parallax is one arc second IV. 3.26 light years V. the longest unit of length in astronomy

An eclipsing binary has been analyzed and it has been determined that the ratio of the mass of star A to the mass of star B is 6 and the total mass of the two stars is 26 solar masses. What are the masses of star A and star B?

Doppler-shift observations of a spectroscopic binary star can enable astronomers to calculate ________ of its individual stars.

Diagram 8-1 Use the H-R diagram below to answer the following question(s). Which star in Diagram 8-1 is most like the Sun?

The absorption lines in the ultraviolet portion of the spectrum of a star that are produced by hydrogen are from the

The largest of the red stars are the ____________________ stars.

-Table 8-1 Use the chart below to answer the following question(s) From the data given, which star in Table 8-1 would appear the faintest in the night sky?

A G2 I star is in diameter and luminous than the Sun.

What is the correct order of densities from least to most?

Polaris is 132 pc from Earth and has an absolute visual magnitude of -3.1. What is the apparent visual magnitude of this star?

The hydrogen lines in spectral type A stars

An 05 star has an H_α line present in its spectra. What color is the line?

White dwarfs have such a low luminosity that even the nearest white dwarfs are not visible to the naked eye.

Which one of the methods below enables astronomers to measure the distance of a star near the Sun in our galaxy?

On the H-R diagram, cool and bright stars are located in the ________ corner.

The absolute magnitude of a star is the apparent magnitude it would have if it were 10 pc from Earth.

What kind of spectra is shown in the color photographs above?

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

Origin of the Solar System and Extrasolar Planets

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

Acrux has an M V = -4.2 and an m V = 0.81. Therefore, Acrux is actually brighter than we perceive it to be.

Which statement is incorrect about the above spectra?

As shown in the above spectra, which is taken at two different times, a ________ is concluded.

A parsec is I. a unit of length used in astronomy II. 2.06 × 105 AU III. the distance to an imaginary star whose stellar parallax is one arc second IV. 3.26 light years V. the longest unit of length in astronomy

An eclipsing binary has been analyzed and it has been determined that the ratio of the mass of star A to the mass of star B is 6 and the total mass of the two stars is 26 solar masses. What are the masses of star A and star B?

Doppler-shift observations of a spectroscopic binary star can enable astronomers to calculate ________ of its individual stars.

Diagram 8-1 Use the H-R diagram below to answer the following question(s). Which star in Diagram 8-1 is most like the Sun?

The absorption lines in the ultraviolet portion of the spectrum of a star that are produced by hydrogen are from the

The largest of the red stars are the ____________________ stars.

-Table 8-1 Use the chart below to answer the following question(s) From the data given, which star in Table 8-1 would appear the faintest in the night sky?

A G2 I star is ____________________ in diameter and ____________________ luminous than the Sun.

What is the correct order of densities from least to most?

Polaris is 132 pc from Earth and has an absolute visual magnitude of -3.1. What is the apparent visual magnitude of this star?

The hydrogen lines in spectral type A stars

An 05 star has an H α line present in its spectra. What color is the line?

White dwarfs have such a low luminosity that even the nearest white dwarfs are not visible to the naked eye.

Which one of the methods below enables astronomers to measure the distance of a star near the Sun in our galaxy?

On the H-R diagram, cool and bright stars are located in the ________ corner.

The absolute magnitude of a star is the apparent magnitude it would have if it were 10 pc from Earth.

What kind of spectra is shown in the color photographs above?

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

Origin of the Solar System and Extrasolar Planets

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

Acrux has an M _V = -4.2 and an m _V = 0.81. Therefore, Acrux is actually brighter than we perceive it to be.

A parsec is I. a unit of length used in astronomy II. 2.06 × 10⁵ AU III. the distance to an imaginary star whose stellar parallax is one arc second IV. 3.26 light years V. the longest unit of length in astronomy

A G2 I star is in diameter and luminous than the Sun.

An 05 star has an H_α line present in its spectra. What color is the line?