Question 1

We know that giant stars are larger in diameter than the Sun because

Accepted Answer

A) they are more luminous but have about the same temperature. 
B) they are less luminous but have about the same temperature. 
C) they are hotter but have about the same luminosity. 
D) they are cooler but have about the same luminosity. 
E) they have a larger absolute magnitude than the Sun. 
A) they are more luminous but have about the same temperature. 
B) they are less luminous but have about the same temperature. 
C) they are hotter but have about the same luminosity. 
D) they are cooler but have about the same luminosity. 
E) they have a larger absolute magnitude than the Sun.

Question 2

If a star is twice as hot as the Sun and only half the Sun's diameter, it will be less luminous than the Sun.

Accepted Answer

A) True 
 B)False

Question 3

In a binary system, the more massive star

Accepted Answer

A) is at the center of mass. 
B) is farthest from the center of mass. 
C) is nearest the center of mass. 
D) follows the largest orbit. 
E) shows a larger Doppler shift in its spectral lines. 
A) is at the center of mass. 
B) is farthest from the center of mass. 
C) is nearest the center of mass. 
D) follows the largest orbit. 
E) shows a larger Doppler shift in its spectral lines.

Question 4

What information about orbital inclination can we get from visual binaries, spectroscopic binaries, and eclipsing binaries

Accepted Answer

Astronomers can find the inclination of

Question 5

Ross 128 is 1.1 times further than Ross 154. As such, the parallax angle of Ross 128 is 0.9 times larger than Ross 154.

Accepted Answer

A) True 
 B)False

Question 6

Hydrogen Balmer lines are strongest near ____ spectral class whereas ionized Calcium (CaII) lines are strong in ___ stars.

Accepted Answer

A) A0, K 
B) O5, M5 
C) M5, G1 
D) M0, B0 
A) A0, K 
B) O5, M5 
C) M5, G1 
D) M0, B0

Question 7

Based upon the information given in the following color photographs, what would you predict to see in a spectra class L0 color photo

Accepted Answer

A) mostly lines including hydrogen and helium 
B) mostly molecular bands such as iron hydride (FeH) 
C) mostly lines including sodium and helium 
D) mostly molecular lines like H, He, Na 
A) mostly lines including hydrogen and helium 
B) mostly molecular bands such as iron hydride (FeH) 
C) mostly lines including sodium and helium 
D) mostly molecular lines like H, He, Na

Question 8

Compared with the spectral lines in the solar spectrum, lines in a supergiant spectrum are

Accepted Answer

A) sharper. 
B) broader. 
C) weaker. 
D) stronger. 
E) broader and weaker. 
A) sharper. 
B) broader. 
C) weaker. 
D) stronger. 
E) broader and weaker.

Question 9

A pair of stars orbit around one another in an elliptical orbit with a semi-major axis, a, of 1 AU with an orbital period, P, of 1 year. What is the mass of the pair of stars

Accepted Answer

A) 1 solar masses 
B) 2 solar masses 
C) 4 solar masses 
D) 8 solar masses 
E) 16 solar masses 
A) 1 solar masses 
B) 2 solar masses 
C) 4 solar masses 
D) 8 solar masses 
E) 16 solar masses

Question 10

Giant stars are members of luminosity class III.

Accepted Answer

A) True 
 B)False

Question 11

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 12

Stars in the upper right part of the Hertzsprung-Russell diagram are always ____ when compared to stars near the middle of the diagram.

Accepted Answer

A) cooler 
B) brighter as seen from Earth 
C) larger 
D) smaller 
E) more massive 
A) cooler 
B) brighter as seen from Earth 
C) larger 
D) smaller 
E) more massive

Question 13

The two stars near one another are shown. Positions of one member are shown relative to the other star at different times. From plots like this one, astronomers conclude that

Accepted Answer

A) the stars are in an elliptical orbit around one another. 
B) the mass of the pair can be estimated. 
C) one star is passing by the other never to return. 
D) both the stars are in an elliptical orbit around one another. 
A) the stars are in an elliptical orbit around one another. 
B) the mass of the pair can be estimated. 
C) one star is passing by the other never to return. 
D) both the stars are in an elliptical orbit around one another.

Question 14

Stellar parallax is used to measure distances of celestial bodies within the solar system.

Accepted Answer

A) True 
 B)False

Question 15

Α star has a radius similar to that of the Sun but half the Sun's luminosity. What is the surface temperature of this star using this data

Accepted Answer

A) 0.84 TSun 
B) 0.43 TSun 
C) 1.2 TSun 
D) 2.4 TSun 
A) 0.84 TSun 
B) 0.43 TSun 
C) 1.2 TSun 
D) 2.4 TSun

Question 16

To observe a spectroscopic binary, we must be able to see both stars individually.

Accepted Answer

A) True 
 B)False

Question 17

The total mass of a binary system can be calculated from

Accepted Answer

A) the ratio of the angular separation from the center of mass of each of the stars. 
B) the distance to the binary and its radial velocity. 
C) the semimajor axis and period of the orbit. 
D) the radial velocities of the two stars. 
E) the time required for the smaller star to eclipse the larger star. 
A) the ratio of the angular separation from the center of mass of each of the stars. 
B) the distance to the binary and its radial velocity. 
C) the semimajor axis and period of the orbit. 
D) the radial velocities of the two stars. 
E) the time required for the smaller star to eclipse the larger star.

Question 18

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 19

In a/an ____________ binary, the orbits of both stars can be mapped.

Accepted Answer

The answer of In a/an ____________ binary, the orbits of...

Question 20

Most stars on the H-R diagram are on the ____________________.

Accepted Answer

The answer of Most stars on the H-R diagram are...

We know that giant stars are larger in diameter than the Sun because

If a star is twice as hot as the Sun and only half the Sun's diameter, it will be less luminous than the Sun.

In a binary system, the more massive star

What information about orbital inclination can we get from visual binaries, spectroscopic binaries, and eclipsing binaries

Ross 128 is 1.1 times further than Ross 154. As such, the parallax angle of Ross 128 is 0.9 times larger than Ross 154.

Hydrogen Balmer lines are strongest near __ spectral class whereas ionized Calcium (CaII) lines are strong in _ stars.

Based upon the information given in the following color photographs, what would you predict to see in a spectra class L0 color photo

Compared with the spectral lines in the solar spectrum, lines in a supergiant spectrum are

A pair of stars orbit around one another in an elliptical orbit with a semi-major axis, a, of 1 AU with an orbital period, P, of 1 year. What is the mass of the pair of stars

Giant stars are members of luminosity class III.

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

Stars in the upper right part of the Hertzsprung-Russell diagram are always ____ when compared to stars near the middle of the diagram.

The two stars near one another are shown. Positions of one member are shown relative to the other star at different times. From plots like this one, astronomers conclude that

Stellar parallax is used to measure distances of celestial bodies within the solar system.

Α star has a radius similar to that of the Sun but half the Sun's luminosity. What is the surface temperature of this star using this data

To observe a spectroscopic binary, we must be able to see both stars individually.

The total mass of a binary system can be calculated from

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

In a/an ____________ binary, the orbits of both stars can be mapped.

Most stars on the H-R diagram are on the ____________________.

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

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Exam 8: The Family of Stars

We know that giant stars are larger in diameter than the Sun because

If a star is twice as hot as the Sun and only half the Sun's diameter, it will be less luminous than the Sun.

In a binary system, the more massive star

What information about orbital inclination can we get from visual binaries, spectroscopic binaries, and eclipsing binaries

Ross 128 is 1.1 times further than Ross 154. As such, the parallax angle of Ross 128 is 0.9 times larger than Ross 154.

Hydrogen Balmer lines are strongest near ____ spectral class whereas ionized Calcium (CaII) lines are strong in ___ stars.

Based upon the information given in the following color photographs, what would you predict to see in a spectra class L0 color photo

Compared with the spectral lines in the solar spectrum, lines in a supergiant spectrum are

A pair of stars orbit around one another in an elliptical orbit with a semi-major axis, a, of 1 AU with an orbital period, P, of 1 year. What is the mass of the pair of stars

Giant stars are members of luminosity class III.

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

Stars in the upper right part of the Hertzsprung-Russell diagram are always ____ when compared to stars near the middle of the diagram.

The two stars near one another are shown. Positions of one member are shown relative to the other star at different times. From plots like this one, astronomers conclude that

Stellar parallax is used to measure distances of celestial bodies within the solar system.

Α star has a radius similar to that of the Sun but half the Sun's luminosity. What is the surface temperature of this star using this data

To observe a spectroscopic binary, we must be able to see both stars individually.

The total mass of a binary system can be calculated from

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

In a/an ____________ binary, the orbits of both stars can be mapped.

Most stars on the H-R diagram are on the ____________________.

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

Hydrogen Balmer lines are strongest near __ spectral class whereas ionized Calcium (CaII) lines are strong in _ stars.