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Exam 11: Surveying the Stars

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Question 61

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On a Hertzsprung-Russell diagram, where would you find stars that are cool and dim?

A) upper right
B) lower right
C) upper left
D) lower left

E) B) and D)
F) A) and C)

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Question 62

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What is the common trait of all main sequence stars?

A) They generate energy through hydrogen fusion in their core.
B) They are in the final stage of their lives.
C) They are all spectral type G.
D) They all have approximately the same mass.

E) B) and D)
F) B) and C)

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Question 63

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Blue stars are always more luminous than red stars

The size of the Earth's orbit is doubled. This will allow the parallaxes of more distant stars to be measured.

The following questions refer to the sketch of the H-R diagram below. Choose the best answer in each case. Note that choice (a) refers to the entire main sequence, while (c) and (d) refer to only small parts of the main sequence. If choice (c) or (d) offers a better answer to a particular question than (a) , use the best choice. You may use the same choice more than once. -Which group includes stars that are burning elements besides hydrogen in their cores?

Each choice below lists a spectral type and luminosity class for a star. Which one is a red supergiant?

You measure the parallax angle for a star to be 0.5 arcseconds. The distance to this star is

Which of the following is the most numerous type of main-sequence star?

The choices below each describe the appearance of an H-R diagram for a different star cluster. Which cluster is most likely to be located in the halo of our galaxy?

Which of the following statements about globular clusters is true?

You measure the parallax angle for a star to be 0.1 arcseconds. The distance to this star is

What are the standard units for luminosity?

The following questions refer to the sketch of the H-R diagram below. Choose the best answer in each case. Note that choice (a) refers to the entire main sequence, while (c) and (d) refer to only small parts of the main sequence. If choice (c) or (d) offers a better answer to a particular question than (a) , use the best choice. You may use the same choice more than once. -Which group represents stars that are hot and very bright?

The star Vega has an absolute magnitude of about 4 and an apparent magnitude of about 0. Based on the definitions of absolute and apparent magnitude, we can conclude that ________.

The more distant a star, the smaller its parallax.

The total amount of power (in watts, for example) that a star radiates into space is called its ________.

Some stars are cool enough to have molecules in their atmosphere.

Which of the following stellar properties has the greatest range in values?

On a Hertzsprung-Russell diagram, where would you find white dwarfs?

The following questions refer to the sketch of the H-R diagram below. Choose the best answer in each case. Note that choice (a) refers to the entire main sequence, while (c) and (d) refer to only small parts of the main sequence. If choice (c) or (d) offers a better answer to a particular question than (a) , use the best choice. You may use the same choice more than once. -Which group represents stars that are hot but dim?