Question 1

If a binary system has a period of 4 years and a separation of 5 AU, then the total mass is 7.8 solar masses.

Accepted Answer

A) True 
 B)False

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

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.F) A) and B)
G) A) and C)

Question 4

How do humans use their eyes to measure relative distance by parallax?

Accepted Answer

A)   By continuously focusing our eyes on distant objects we can determine distance.
B)   Since our eyes are separated the brain interprets the relative look angles of these eyes in terms of distance to the object viewed.
C)   Our eyes can measure the time it takes light to travel from an object and from this we get distance.
D)   By moving our heads from side to side our brain compares look angles from each of these positions to obtain the distance to the object viewed.E) None of the above
F) A) and D)

Question 5

Below is a radial velocity curve for a spectroscopic binary. Which of the stars is most massive? ____________________

Accepted Answer

The answer of Below is a radial velocity curve for...

Question 6

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.F) B) and D)
G) C) and E)

Question 7

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 semi major axis and period of the orbit.
D)   the radial velocities of the two stars.
E)   the time required for the small star to eclipse the larger star.F) A) and E)
G) B) and D)

Question 8

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 massiveF) B) and E)
G) A) and C)

Question 9

We can determine the surface temperature of a star from

Accepted Answer

A)   studying its continuous spectrum.
B)   studying its line absorption spectrum.
C)   measuring the star s luminosity.
D)   Both a and c
E)   All of a, b, and cF) A) and C)
G) C) and D)

Question 10

Giant stars are members of luminosity class III.

Accepted Answer

A) True 
 B)False

Question 11

To observe a visual binary, we must measure radial velocities.

Accepted Answer

A) True 
 B)False

Question 12

To determine the orbital period of a visual binary, we must measure

Accepted Answer

A)   brightness.
B)   position on the sky.
C)   wavelengths.
D)   luminosity.
E)   temperature.F) None of the above
G) A) and B)

Question 13

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

Accepted Answer

A)   65 Tau
B)   HR 4621
C)   a Pic
D)   58 Ori
E)   HR 2491F) A) and E)
G) A) and B)

Question 14

How do absolute visual magnitude and luminosity differ?

Accepted Answer

The answer of How do absolute visual magnitude and luminosity...

Question 15

If you compare two stars,

Accepted Answer

A)   the one with the larger radius will always have the greater luminosity.
B)   the one with the higher surface temperature will always have the greater luminosity.
C)   the one with the smaller absolute magnitude will always have the greater luminosity.
D)   the one with the larger surface area has the greater energy flux from its surface.E) A) and D)
F) C) and D)

Question 16

Use the chart below to answer the following question(s) . 
-From the data given, which star in the table has the greatest luminosity?

Accepted Answer

A)   65 Tau
B)   HR 4621
C)   a Pic
D)   58 Ori
E)   HR 2491F) B) and C)
G) A) and E)

Question 17

If we can solve the orbital motion of an eclipsing binary, we can find

Accepted Answer

A)   the mass of each star.
B)   the diameter of each star.
C)   the distance to the binary.
D)   all of the above
E)   both a and bF) B) and C)
G) A) and E)

Question 18

The two most abundant elements in the sun are

Accepted Answer

A)   nitrogen and oxygen.
B)   hydrogen and helium.
C)   sulfur and iron.
D)   carbon and hydrogen.
E)   carbon and nitrogen.F) A) and C)
G) None of the above

Question 19

Use the chart below to answer the following question(s) . 
-Which star in the table has the greatest surface temperature?

Accepted Answer

A)   d Cen
B)   HR 4607
C)   HR 4758
D)   HD 39801
E)   9 CMaF) A) and D)
G) B) and E)

Question 20

Use the HR diagram below to answer the following question(s) .  Which of the stars in the diagram has the largest absolute visual magnitude?

Accepted Answer

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

Exam 9: The Family of Stars

If you compare two stars,

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How do humans use their eyes to measure relative distance by parallax?

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Use the chart below to answer the following question(s) . -Which star in the table has the greatest surface temperature?

Correct AnswerverifiedShow Answer

To determine the orbital period of a visual binary, we must measure

Correct AnswerverifiedShow Answer

The total mass of a binary system can be calculated from

Correct AnswerverifiedShow Answer

If a binary system has a period of 4 years and a separation of 5 AU, then the total mass is 7.8 solar masses.

Correct AnswerverifiedShow Answer

Giant stars are members of luminosity class III.

Correct AnswerverifiedShow Answer

To observe a visual binary, we must measure radial velocities.

Correct AnswerverifiedShow Answer

The two most abundant elements in the sun are

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We can determine the surface temperature of a star from

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Use the HR diagram below to answer the following question(s) . Which of the stars in the diagram has the largest absolute visual magnitude?

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

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If we can solve the orbital motion of an eclipsing binary, we can find

Correct AnswerverifiedShow Answer

A star s luminosity depends only on the star s

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

How do absolute visual magnitude and luminosity differ?

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

Correct AnswerverifiedShow Answer

Use the chart below to answer the following question(s) . -From the data given, which star in the table has the greatest luminosity?

Correct AnswerverifiedShow Answer

Below is a radial velocity curve for a spectroscopic binary. Which of the stars is most massive? ____________________

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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