Question 1

The most accurate way to determine the surface temperature of a star is to study

Accepted Answer

A)   the pattern of absorption lines from various atoms.
B)   the relative intensities of light measured through different photometric filters.
C)   the peak wavelength of the star's continuum blackbody spectrum.
D)   pattern of emission lines that are on the star's spectrum.E) B) and C)
F) A) and D)

Question 2

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) B) and E)
G) A) and D)

Question 3

Use the following chart to answer the questions below:
  
-Refer to Table 9-1.The star HR 4621 is

Accepted Answer

A)   closer than 10 pc.
B)   farther than 10 pc.
C)   No way to tell.D) All of the above
E) B) and C)

Question 4

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

Accepted Answer

A)   the masses
B)   the sizes
C)   both a and b
D)   neither a nor bE) A) and B)
F) B) and C)

Question 5

The correct sequence of spectral type letters from hot on the left to cool on the right is

Accepted Answer

A)   M,K,G,F,A,B,O
B)   O,B,A,F,G,K,M
C)   G,K,M,F,O,B,A
D)   A,B,O,F,G,K,ME) A) and D)
F) A) and C)

Question 6

The location of a star in the HR diagram indicates its temperature and intrinsic brightness.

Accepted Answer

A) True 
 B)False

Question 7

The distance to Rigel is 250 pc.Which of the following statements is true based on this information?

Accepted Answer

A)   The distance to Rigel can be determined by measuring its parallax.
B)   Rigel's apparent visual magnitude has a smaller value than its absolute visual magnitude.
C)   The absolute bolometric magnitude of Rigel is nearly equal to its absolute visual magnitude.
D)   Rigel is located in the upper right corner of the HR diagram.
E)   none of the aboveF) A) and B)
G) D) and E)

Question 8

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 lines in the spectrum of the star.
D)   By observing the angular size of the star's image in a photograph or digital image.E) B) and C)
F) C) and D)

Question 9

A star's absolute magnitude 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) C) and D)
G) A) and B)

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

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

Accepted Answer

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

Question 12

Luminosity class IV objects are known as ____________________.

Accepted Answer

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

Question 13

Absolute visual magnitude is

Accepted Answer

A)   the apparent magnitude of a star observed from Earth.
B)   the luminosity of a star observed from a distance of 1000 pc.
C)   the apparent magnitude of a star observed from a distance of 10 pc.
D)   the luminosity of a star observed from Earth.
E)   c and dF) B) and D)
G) B) and C)

Question 14

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 the Earth's movement around the SunE) A) and B)
F) None of the above

Question 15

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)   b and cF) A) and B)
G) A) and C)

Question 16

Use the following chart to answer the questions below:
  NARREND
-Which star in Table 9-2 would appear the faintest in the night sky?

Accepted Answer

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

Question 17

A star's apparent magnitude is a measure of ...

Accepted Answer

A)   how bright it appears to us if it is at its actual distance.
B)   how bright it appears to us at a standard distance of 10 pc.
C)   its energy output per second compared to the sun.
D)   its mass in solar masses.
E)   its surface temperature in degrees Kelvin.F) A) and E)
G) A) and C)

Question 18

Giant stars are

Accepted Answer

A)   I & II
B)   II & IV
C)   I,II,& IV
D)   II,III,& IV
E)   I,II,III,& IVF) C) and E)
G) A) and B)

Question 19

In the H-R diagram,90 percent of all stars are

Accepted Answer

A)   in the giant region.
B)   in the supergiant region.
C)   among the B stars.
D)   among the G stars.
E)   on the main sequence.F) C) and E)
G) A) and B)

Question 20

The mass of a visual binary pair of stars can be obtained from

Accepted Answer

A)   the time in years for them to orbit one another.
B)   the size of their orbit.
C)   their apparent magnitudes.
D)   both a and bE) A) and B)
F) B) and C)

Exam 9: The Family of Stars

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

Correct Answer
verified

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

Correct Answer
verified

The correct sequence of spectral type letters from hot on the left to cool on the right is

Correct Answer
verified

The most accurate way to determine the surface temperature of a star is to study

Correct Answer
verified

Giant stars are

Correct Answer
verified

How is a luminosity class assigned to a star?

Correct Answer
verified

Absolute visual magnitude is

Correct Answer
verified

The location of a star in the HR diagram indicates its temperature and intrinsic brightness.

Correct Answer
verified

In the H-R diagram,90 percent of all stars are

Correct Answer
verified

A star's absolute magnitude depends only on the star's

Correct Answer
verified

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

Correct Answer
verified

The mass of a visual binary pair of stars can be obtained from

Correct Answer
verified

Use the following chart to answer the questions below: -Refer to Table 9-1.The star HR 4621 is

Correct Answer
verified

Luminosity class IV objects are known as ____________________.

Correct Answer
verified

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

Correct Answer
verified

The distance to Rigel is 250 pc.Which of the following statements is true based on this information?

Correct Answer
verified

A star's apparent magnitude is a measure of ...

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

Exam 9: The Family of Stars

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The correct sequence of spectral type letters from hot on the left to cool on the right is

Correct AnswerverifiedShow Answer

The most accurate way to determine the surface temperature of a star is to study

Correct AnswerverifiedShow Answer

Giant stars are

Correct AnswerverifiedShow Answer

How is a luminosity class assigned to a star?

Correct AnswerverifiedShow Answer

Absolute visual magnitude is

Correct AnswerverifiedShow Answer

The location of a star in the HR diagram indicates its temperature and intrinsic brightness.

Correct AnswerverifiedShow Answer

In the H-R diagram,90 percent of all stars are

Correct AnswerverifiedShow Answer

A star's absolute magnitude depends only on the star's

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The mass of a visual binary pair of stars can be obtained from

Correct AnswerverifiedShow Answer

Use the following chart to answer the questions below: -Refer to Table 9-1.The star HR 4621 is

Correct AnswerverifiedShow Answer

Luminosity class IV objects are known as ____________________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The distance to Rigel is 250 pc.Which of the following statements is true based on this information?

Correct AnswerverifiedShow Answer

A star's apparent magnitude is a measure of ...

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Use the following chart to answer the questions below: NARREND -Which star in Table 9-2 would appear the faintest in the night sky?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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