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Ryan Tram
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Astronomy

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Ryan Tram
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Chapter 6

Question 6 of 15 Question 1 of 15

1

What is the spectral sequence in order of increasing temperature?

Select one of the following:

  • BAFGKMO

  • MKGFABO

  • ABFMKGO

  • MKFAGBO

Explanation

Question 10 of 15 Question 2 of 15

1

Which of the following can we use to determine the surface temperature of a star?

Select one of the following:

  • determining if the star has a companion star

  • studying its line absorption spectrum

  • measuring the star’s parallax

  • measuring the star’s distance

Explanation

Question 8 of 15 Question 3 of 15

1

The table lists the spectral types for each of four stars. Which star in this table would have the lowest surface temperature?

Select one of the following:

  • ξ Per

  • α For

  • ο Cet

  • γ Tri

Explanation

Question 2 of 15 Question 4 of 15

1

The table lists the spectral types for each of four stars. Which star in this table would have the highest surface temperature?

Select one of the following:

  • γ Tri

  • a

  • α For

  • ξ Per

Explanation

Question 5 of 15 Question 5 of 15

1

What properties of a star determine its luminosity?

Select one of the following:

  • temperature and distance

  • apparent magnitude and temperature

  • temperature and diameter

  • distance and diameter

Explanation

Question 9 of 15 Question 6 of 15

1

How do we know that giant stars are larger in diameter than the Sun?

Select one of the following:

  • They are less luminous but have about the same temperature

  • They are cooler but have about the same luminosity

  • They are more luminous but have about the same temperature

  • They are hotter but have about the same luminosity

Explanation

Question 15 of 15 Question 7 of 15

1

Sirius A and B are two stars at the same distance from the Earth. In this binary system, Sirius A is much brighter but Sirius B is much hotter. From this information, what can you conclude about the two stars?

Select one of the following:

  • Sirius B must be much less massive than Sirius A

  • Sirius B must be much more massive than Sirius A

  • Sirius B must be much larger than Sirius A

  • Sirius B must be much smaller than Sirius A

Explanation

Question 12 of 15 Question 8 of 15

1

In a Hertzsprung-Russell diagram, where are the stars with the smallest radius found?

Select one of the following:

  • in the lower right corner

  • in the upper right corner

  • in the lower left corner

  • in the upper left corner

Explanation

Question 4 of 15 Question 9 of 15

1

In a Hertzsprung-Russell diagram, where are 90 percent of all the stars found?

Select one of the following:

  • in the supergiant region

  • on the dwarf sequence

  • in the giant region

  • on the main sequence

Explanation

Question 13 of 15 Question 10 of 15

1

The star named Sheat is of spectral type M2 and luminosity class II. Based on this information, how does Sheat compare to the Sun?

Select one of the following:

  • Sheat is cooler and larger than the Sun

  • Sheat is hotter and more luminous than the Sun

  • Sheat is hotter and larger than the Sun

  • Sheat is cooler and smaller than the Sun

Explanation

Question 7 of 15 Question 11 of 15

1

The star named Circini has the spectral type and luminosity class of O 8.5 V. Based on this information, how does Circini compare to the Sun?

Select one of the following:

  • Circini is hotter and less luminous than the Sun

  • Circini is hotter and more luminous than the Sun

  • Circini is cooler and smaller than the Sun

  • Circini is cooler and larger than the Sun

Explanation

Question 3 of 15 Question 12 of 15

1

Where are red giant stars found in the Hertzsprung-Russell diagram?

Select one of the following:

  • on the upper main sequence

  • above the main sequence

  • below the main sequence

  • on the lower main sequence

Explanation

Question 11 of 15 Question 13 of 15

1

Which star in the table is the closest to Earth?

Select one of the following:

  • δ Cen

  • HR 4758

  • 9 CMa

  • HD 39801

Explanation

Question 1 of 15 Question 14 of 15

1

Which star in the table has the highest surface temperature?

Select one of the following:

  • HD 39801

  • δ Cen

  • HR 4758

  • 9 CMa

Explanation

Question 14 of 15 Question 15 of 15

1

Which star in the table has the largest diameter?

Select one of the following:

  • δ Cen

  • HR 4758

  • 9 CMa

  • HD 39801

Explanation

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