Question 1

Which of the following kind of stars is most dense?

Accepted Answer

A)  a supergiant star 
B)  a main sequence star 
C)  a giant star 
D)  a white dwarf 
E)  the Sun 
A)  a supergiant star 
B)  a main sequence star 
C)  a giant star 
D)  a white dwarf 
E)  the Sun

Question 2

An eclipsing binary will

Accepted Answer

A)  be more luminous than a visual binary. 
B)  also be observed as a spectroscopic binary. 
C)  give off most of its light in the infrared. 
D)  show a constant Doppler shift in its spectral lines. 
E)  show two stars with variable proper motion. 
A)  be more luminous than a visual binary. 
B)  also be observed as a spectroscopic binary. 
C)  give off most of its light in the infrared. 
D)  show a constant Doppler shift in its spectral lines. 
E)  show two stars with variable proper motion.

Question 3

The larger variation in brightness in an eclipsing system consisting of a white dwarf and an M3 main-sequence star occurs when the white dwarf passes behind the M3 star.

Accepted Answer

A) True 
 B)False

Question 4

A spectroscopic binary shows periodic variations in its

Accepted Answer

A)  radial velocity. 
B)  proper motion. 
C)  brightness. 
D)  mass. 
E)  spectral type. 
A)  radial velocity. 
B)  proper motion. 
C)  brightness. 
D)  mass. 
E)  spectral type.

Question 5

By how much did the flux increase or decrease from point 1 to point 2 in the above figure if the distance to 1 is r and the distance to 2 is 2 r ?

Accepted Answer

A)  increase by double 
B)  decrease by double 
C)  increase by quadruple 
D)  decrease by quadruple 
A)  increase by double 
B)  decrease by double 
C)  increase by quadruple 
D)  decrease by quadruple

Question 6

​ Which are the most common stars, massive stars or low-mass stars (relative to the Sun)?  High luminosity or low luminosity (relative to the Sun)?

Accepted Answer

The most common type

Question 7

The luminosity of a star is the total amount of energy it radiates each second.

Accepted Answer

A) True 
 B)False

Question 8

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 9

Supergiants are about as common as the Sun.

Accepted Answer

A) True 
 B)False

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 has the greatest surface temperature?

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

How can we tell that some stars are relatively close to us in the sky?

Accepted Answer

A)  Some stars are occasionally eclipsed by the Moon, so they must be nearby. 
B)  Some stars vary in brightness caused by sunspots we can see because they are so close. 
C)  Some stars appear to be extremely bright and must therefore be very close to us. 
D)  Some stars appear to move periodically back and forth against the background stars because of Earth's movement around the Sun. 
A)  Some stars are occasionally eclipsed by the Moon, so they must be nearby. 
B)  Some stars vary in brightness caused by sunspots we can see because they are so close. 
C)  Some stars appear to be extremely bright and must therefore be very close to us. 
D)  Some stars appear to move periodically back and forth against the background stars because of Earth's movement around the Sun.

Question 12

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

Accepted Answer

A) True 
 B)False

Question 13

If we divide the mass of a star by its volume we calculate the star's ____________________.

Accepted Answer

The answer of If we divide the mass of a...

Question 14

What measurements are needed to determine the orbital motion of a spectroscopic binary star?

Accepted Answer

Measure the spectra of the bin

Question 15

The distance to Canopus is 96 pc. What is the parallax angle as observed from the Sun?

Accepted Answer

A)  0.01 degrees 
B)  0.01 arc minutes 
C)  0.01 arc seconds 
D)  96 pc 
A)  0.01 degrees 
B)  0.01 arc minutes 
C)  0.01 arc seconds 
D)  96 pc

Question 16

The Lyman series lines of hydrogen all lie in the infrared.

Accepted Answer

A) True 
 B)False

Question 17

The total mass of the pair of stars in spectroscopic binaries are difficult to estimate because

Accepted Answer

A)  we can't measure the radial velocities of each star in the system. 
B)  we can't see the shape or tilt of the orbit. 
C)  we can't find the diameters of the stars. 
D)  we can't determine the luminosities of the stars. 
E)  the Doppler shift is not measurable. 
A)  we can't measure the radial velocities of each star in the system. 
B)  we can't see the shape or tilt of the orbit. 
C)  we can't find the diameters of the stars. 
D)  we can't determine the luminosities of the stars. 
E)  the Doppler shift is not measurable.

Question 18

Where would Class Ia be located on the H-R diagram?

Accepted Answer

A)  a line through the giants 
B)  a horizontal line through the supergiants 
C)  along the main sequence 
D)  along the white dwarf line 
A)  a line through the giants 
B)  a horizontal line through the supergiants 
C)  along the main sequence 
D)  along the white dwarf line

Question 19

In an H-R diagram, stars with the smallest radius are found in the _________ of the diagram.

Accepted Answer

A)  center 
B)  upper left corner 
C)  upper right corner 
D)  lower left corner 
E)  lower right corner 
A)  center 
B)  upper left corner 
C)  upper right corner 
D)  lower left corner 
E)  lower right corner

Question 20

The densest stars in the H-R diagram are the white dwarfs.

Accepted Answer

A) True 
 B)False

Which of the following kind of stars is most dense?

An eclipsing binary will

The larger variation in brightness in an eclipsing system consisting of a white dwarf and an M3 main-sequence star occurs when the white dwarf passes behind the M3 star.

A spectroscopic binary shows periodic variations in its

By how much did the flux increase or decrease from point 1 to point 2 in the above figure if the distance to 1 is r and the distance to 2 is 2 r ?

Which are the most common stars, massive stars or low-mass stars (relative to the Sun)? High luminosity or low luminosity (relative to the Sun)?

The luminosity of a star is the total amount of energy it radiates each second.

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

Supergiants are about as common as the Sun.

-Table 8-1 Use the chart below to answer the following question(s). From the data given, which star in Table 8-1 has the greatest surface temperature?

How can we tell that some stars are relatively close to us in the sky?

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

If we divide the mass of a star by its volume we calculate the star's ____________________.

What measurements are needed to determine the orbital motion of a spectroscopic binary star?

The distance to Canopus is 96 pc. What is the parallax angle as observed from the Sun?

The Lyman series lines of hydrogen all lie in the infrared.

The total mass of the pair of stars in spectroscopic binaries are difficult to estimate because

Where would Class Ia be located on the H-R diagram?

In an H-R diagram, stars with the smallest radius are found in the _________ of the diagram.

The densest stars in the H-R diagram are the white dwarfs.

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

Which of the following kind of stars is most dense?

An eclipsing binary will

The larger variation in brightness in an eclipsing system consisting of a white dwarf and an M3 main-sequence star occurs when the white dwarf passes behind the M3 star.

A spectroscopic binary shows periodic variations in its

By how much did the flux increase or decrease from point 1 to point 2 in the above figure if the distance to 1 is r and the distance to 2 is 2 r ?

​ Which are the most common stars, massive stars or low-mass stars (relative to the Sun)? High luminosity or low luminosity (relative to the Sun)?

The luminosity of a star is the total amount of energy it radiates each second.

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

Supergiants are about as common as the Sun.

-Table 8-1 Use the chart below to answer the following question(s). From the data given, which star in Table 8-1 has the greatest surface temperature?

How can we tell that some stars are relatively close to us in the sky?

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

If we divide the mass of a star by its volume we calculate the star's ____________________.

What measurements are needed to determine the orbital motion of a spectroscopic binary star?

The distance to Canopus is 96 pc. What is the parallax angle as observed from the Sun?

The Lyman series lines of hydrogen all lie in the infrared.

The total mass of the pair of stars in spectroscopic binaries are difficult to estimate because

Where would Class Ia be located on the H-R diagram?

In an H-R diagram, stars with the smallest radius are found in the _________ of the diagram.

The densest stars in the H-R diagram are the white dwarfs.

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

Which are the most common stars, massive stars or low-mass stars (relative to the Sun)? High luminosity or low luminosity (relative to the Sun)?