Question 1

The combined mass of a binary system is three solar masses. Star A is 1 AU and Star B is 2 AU from the center of mass. What are the masses of Star A and Star B, respectively

Accepted Answer

A)  2.5, 0.5
B)  1, 2
C)  2, 1
D)  0.5, 2.5E) B) and C)
F) B) and D)

Question 2

How can we be certain that white dwarfs are very small

Accepted Answer

White dwarfs lie in the lower ...

Question 3

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 4

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 5

How is a luminosity class assigned to a star

Accepted Answer

A)  by combining the apparent magnitude with the star's parallax
B)  by measuring the period of variability in the star's apparent magnitude
C)  by studying the absorption line width in the spectrum of the star
D)  by observing the angular size of the star's image in a photograph or digital imageE) C) and D)
F) A) and C)

Question 6

The diagram below shows the radial velocity curve of a double-line spectroscopic binary. Based on this radial velocity curve, which of the following statements is correct

Accepted Answer

A)  Star A is twice the mass of star B.
B)  Star B is twice the mass of star A.
C)  Star A is ten times the mass of star B.
D)  Star B is ten times the mass of star A.
E)  Star A and Star B have the same mass.F) B) and D)
G) B) and E)

Question 7

Describe the measurements needed to determine the orbit of a visual binary star.

Accepted Answer

Measure the positions of the t...

Question 8

Table 8-2

-Which star in Table 8-2 has the greatest diameter

Accepted Answer

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

Question 9

Which of the following kinds of stars best obey the mass-luminosity relation

Accepted Answer

A)  main-sequence stars
B)  giant stars
C)  supergiant stars
D)  white dwarfs
E)  All of the other choices are correct.F) A) and D)
G) D) and E)

Question 10

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

Accepted Answer

A)  more narrow.
B)  broader.
C)  weaker.
D)  stronger.
E)  broader and weaker.F) A) and B)
G) B) and C)

Question 11

Luminosity class IV objects are known as ____________________.

Accepted Answer

The answer of Luminosity class IV objects are known as...

Question 12

Betelgeuse has an MV = -5 and 1000 times the radius of the Sun. Barnard's Star has an MV = 13.2 and 100 times smaller than the Sun. Therefore, we can determine that the stars have the same temperature.

Accepted Answer

A) True 
 B)False

Question 13

Hadar has an apparent visual magnitude of 0.6 and an absolute visual magnitude of -5.4. Its distance is 102.2 pc.

Accepted Answer

A) True 
 B)False

Question 14

If a star has a parallax of 0.02 seconds of arc, then its distance is

Accepted Answer

A)  20 pc.
B)  50 pc.
C)  2 pc.
D)  5 pc.
E)  500 pc.F) C) and E)
G) D) and E)

Question 15

According to the text, humans have a _____ size compared to stellar and microscopic objects.

Accepted Answer

A)  extra small
B)  small
C)  medium
D)  largeE) None of the above
F) A) and B)

Question 16

Table 8-1

-From the data given, which star in Table 8-1 is the closest to Earth

Accepted Answer

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

Question 17

The absorption lines in the visible 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.F) A) and D)
G) A) and E)

Question 18

The amount of light received at Earth from a star is called luminosity.

Accepted Answer

A) True 
 B)False

Question 19

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) B) and C)
G) A) and D)

Question 20

The star named Sheat is of M2 II spectral type and luminosity class. Based on this information, which of the following are true
 I.Sheat has a surface temperature less than the Sun.
II.Sheat has a diameter that is greater than that of the Sun.
III.Sheat is more luminous than the Sun.
IV.Sheat is located near the upper left-hand corner in the H-R diagram.

Accepted Answer

A)  I & II
B)  II & IV
C)  II, III, & IV
D)  I, II, & III
E)  I, II, III, & IVF) C) and D)
G) All of the above

Exam 8: The Family of Stars

Hadar has an apparent visual magnitude of 0.6 and an absolute visual magnitude of -5.4. Its distance is 102.2 pc.

Correct Answer
verified

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

Correct Answer
verified

How can we be certain that white dwarfs are very small

Correct Answer
verified
White dwarfs lie in the lower ...
View Answer

The diagram below shows the radial velocity curve of a double-line spectroscopic binary. Based on this radial velocity curve, which of the following statements is correct

Correct Answer
verified

Luminosity class IV objects are known as ____________________.

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Table 8-1 -From the data given, which star in Table 8-1 is the closest to Earth

Correct Answer
verified

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 Answer
verified

According to the text, humans have a _____ size compared to stellar and microscopic objects.

Correct Answer
verified

The combined mass of a binary system is three solar masses. Star A is 1 AU and Star B is 2 AU from the center of mass. What are the masses of Star A and Star B, respectively

Correct Answer
verified

If a star has a parallax of 0.02 seconds of arc, then its distance is

Correct Answer
verified

Describe the measurements needed to determine the orbit of a visual binary star.

Correct Answer
verified
Measure the positions of the t...
View Answer

Betelgeuse has an MV = -5 and 1000 times the radius of the Sun. Barnard's Star has an MV = 13.2 and 100 times smaller than the Sun. Therefore, we can determine that the stars have the same temperature.

Correct Answer
verified

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

Correct Answer
verified

How is a luminosity class assigned to a star

Correct Answer
verified

The amount of light received at Earth from a star is called luminosity.

Correct Answer
verified

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

Correct Answer
verified

Which of the following kinds of stars best obey the mass-luminosity relation

Correct Answer
verified

Table 8-2 -Which star in Table 8-2 has the greatest diameter

Correct Answer
verified

Exam 8: The Family of Stars

Hadar has an apparent visual magnitude of 0.6 and an absolute visual magnitude of -5.4. Its distance is 102.2 pc.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

How can we be certain that white dwarfs are very small

Correct AnswerverifiedWhite dwarfs lie in the lower ...View AnswerShow Answer

The diagram below shows the radial velocity curve of a double-line spectroscopic binary. Based on this radial velocity curve, which of the following statements is correct

Correct AnswerverifiedShow Answer

Luminosity class IV objects are known as ____________________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Table 8-1 -From the data given, which star in Table 8-1 is the closest to Earth

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

According to the text, humans have a _____ size compared to stellar and microscopic objects.

Correct AnswerverifiedShow Answer

The combined mass of a binary system is three solar masses. Star A is 1 AU and Star B is 2 AU from the center of mass. What are the masses of Star A and Star B, respectively

Correct AnswerverifiedShow Answer

If a star has a parallax of 0.02 seconds of arc, then its distance is

Correct AnswerverifiedShow Answer

Describe the measurements needed to determine the orbit of a visual binary star.

Correct AnswerverifiedMeasure the positions of the t...View AnswerShow Answer

Betelgeuse has an MV = -5 and 1000 times the radius of the Sun. Barnard's Star has an MV = 13.2 and 100 times smaller than the Sun. Therefore, we can determine that the stars have the same temperature.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

How is a luminosity class assigned to a star

Correct AnswerverifiedShow Answer

The amount of light received at Earth from a star is called luminosity.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following kinds of stars best obey the mass-luminosity relation

Correct AnswerverifiedShow Answer

Table 8-2 -Which star in Table 8-2 has the greatest diameter

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
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Correct Answer
verified
White dwarfs lie in the lower ...
View Answer

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Measure the positions of the t...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified