Question 1

On the main sequence on an H-R diagram, our Sun lies at about ________.

Accepted Answer

The answer of On the main sequence on an H-R...

Question 2

The Hipparcos mission's data on parallaxes is useful for stellar distances out to about 200 pc.

Accepted Answer

A) True 
 B)False

Question 3

Stars that have masses similar to the Sun's, and sizes similar to the Earth are:

Accepted Answer

A)  main sequence stars.
B)  white dwarfs.
C)  red giants.
D)  red dwarfs.
E)  brown dwarfs.

Question 4

What types of observations are necessary to determine the motion of a star through space?

Accepted Answer

To determine the true space motion of a ...

Question 5

Upon what data do measurements of sizes of eclipsing binaries depend?

Accepted Answer

A)  their orbital periods and separations
B)  their masses and luminosities
C)  their Doppler shifts and durations of stages of their eclipses
D)  their temperatures and speeds
E)  their temperatures and masses

Question 6

What role does helium play in spectral classification?

Accepted Answer

It is ionized in the hottest O...

Question 7

Gaia will be able to measure which two apparent motions of stars?

Accepted Answer

A)  transverse and radial
B)  parallax and transverse
C)  radial and parallax
D)  parallax and orbital
E)  orbital and radial

Question 8

Describe the distance and composition of the Alpha Centauri system.

Accepted Answer

The Alpha Centauri system is composed of...

Question 9

Small stars are ________ common than large stars.

Accepted Answer

The answer of Small stars are ________ common than large...

Question 10

If a star were moved 10 times farther away, its absolute magnitude would drop fivemagnitudes.

Accepted Answer

A) True 
 B)False

Question 11

A star with a parallax of 1 second of arc is at a distance of ________ by definition.

Accepted Answer

The answer of A star with a parallax of 1...

Question 12

In general, the narrower the spectral line of a star:

Accepted Answer

A)  the hotter the star is.
B)  the bigger the star is.
C)  the denser the star is.
D)  the smaller the star is.
E)  the cooler the star is.

Question 13

What is proper motion? How is it related to transverse velocity?

Accepted Answer

Annual apparent motion of a st...

Question 14

Which of the following is the most common type of star?

Accepted Answer

A)  high mass main sequence
B)  low mass main sequence
C)  white dwarfs
D)  red giants
E)  blue supergiants

Question 15

Star A has an absolute magnitude of 2.5 and star B has an apparent magnitude of 2.5, but starA is a main sequence star and star B is a red giant. Which statement below is correct?

Accepted Answer

A)  Star A appears brighter than star B, but actually star B and star A are the same brightness.
B)  Star B appears brighter than star A, but actually star B and star A are the same brightness.
C)  Star A and star B appear to have the same brightness, but actually star B is brighter than starA.
D)  Star A and star B appear to have the same brightness, but actually star A is brighter than starB.
E)  It is impossible to determine how bright these stars are or appear to be relative to one another,given the information above.

Question 16

A star of the Sun's diameter, but twice as hot, must be 16X more luminous than the Sun.

Accepted Answer

A) True 
 B)False

Question 17

In eclipsing binaries, in contrast to spectroscopic binaries, we can also determine a star's:

Accepted Answer

A)  temperature.
B)  color.
C)  speed.
D)  shape.
E)  radius.

Question 18

If a star is found by spectroscopic observations to be about 500 parsecs distant, its parallax is:

Accepted Answer

A)  .2".
B)  .5".
C)  .02".
D)  .002".
E)  .005".

Question 19

What role does hydrogen play in spectral classification?

Accepted Answer

It is most prominent...

Question 20

In a spectroscopic binary, if a pair shows a combined set of lines tonight, but a maximumsplit two nights later, its orbital period must be:

Accepted Answer

A)  one day.
B)  two days.
C)  four days.
D)  eight days.
E)  twelve days.

Exam 17: The Stars: Giants, Dwarfs, and the Main Sequence

If a star were moved 10 times farther away, its absolute magnitude would drop fivemagnitudes.

Correct AnswerverifiedShow Answer

Small stars are ________ common than large stars.

Correct AnswerverifiedShow Answer

What is proper motion? How is it related to transverse velocity?

Correct AnswerverifiedAnnual apparent motion of a st...View AnswerShow Answer

Stars that have masses similar to the Sun's, and sizes similar to the Earth are:

Correct AnswerverifiedShow Answer

If a star is found by spectroscopic observations to be about 500 parsecs distant, its parallax is:

Correct AnswerverifiedShow Answer

In general, the narrower the spectral line of a star:

Correct AnswerverifiedShow Answer

In a spectroscopic binary, if a pair shows a combined set of lines tonight, but a maximumsplit two nights later, its orbital period must be:

Correct AnswerverifiedShow Answer

A star with a parallax of 1 second of arc is at a distance of ________ by definition.

Correct AnswerverifiedShow Answer

Which of the following is the most common type of star?

Correct AnswerverifiedShow Answer

Describe the distance and composition of the Alpha Centauri system.

Correct AnswerverifiedThe Alpha Centauri system is composed of...View AnswerShow Answer

On the main sequence on an H-R diagram, our Sun lies at about ________.

Correct AnswerverifiedShow Answer

What role does hydrogen play in spectral classification?

Correct AnswerverifiedIt is most prominent...View AnswerShow Answer

What role does helium play in spectral classification?

Correct AnswerverifiedIt is ionized in the hottest O...View AnswerShow Answer

A star of the Sun's diameter, but twice as hot, must be 16X more luminous than the Sun.

Correct AnswerverifiedShow Answer

The Hipparcos mission's data on parallaxes is useful for stellar distances out to about 200 pc.

Correct AnswerverifiedShow Answer

Gaia will be able to measure which two apparent motions of stars?

Correct AnswerverifiedShow Answer

What types of observations are necessary to determine the motion of a star through space?

Correct AnswerverifiedTo determine the true space motion of a ...View AnswerShow Answer

Star A has an absolute magnitude of 2.5 and star B has an apparent magnitude of 2.5, but starA is a main sequence star and star B is a red giant. Which statement below is correct?

Correct AnswerverifiedShow Answer

Upon what data do measurements of sizes of eclipsing binaries depend?

Correct AnswerverifiedShow Answer

In eclipsing binaries, in contrast to spectroscopic binaries, we can also determine a star's:

Correct AnswerverifiedShow Answer

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Annual apparent motion of a st...
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The Alpha Centauri system is composed of...
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It is most prominent...
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It is ionized in the hottest O...
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Correct Answer
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To determine the true space motion of a ...
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