Question 1

A star has a parallax angle of 0.019 seconds of arc.  How far away is this star from Earth?

Accepted Answer

The answer of A star has a parallax angle of...

Question 2

Th e apparen t magnitud e o f a sta r observe d fro m a distanc e o f 1 0 pc is called _____.

Accepted Answer

absolute v...

Question 3

If luminosity depends on radius and temperature, what does flux depend on?  _______________

Accepted Answer

The answer of If luminosity depends on radius and temperature,...

Question 4

Recently discovered brown dwarfs have spectra similar to cool O-type stars.

Accepted Answer

A) True 
 B)False

Question 5

Recent discoveries of two types of brown dwarfs have placed these stars near which spectral type of star?

Accepted Answer

A)   hotter than O stars
B)   cooler than O stars
C)   hotter than M stars
D)   cooler than M stars
E)   at exactly the same level as G starsF) B) and E)
G) C) and D)

Question 6

In which spectral sequence are the hottest stars categorized?

Accepted Answer

A)   O stars
B)   B stars
C)   A stars
D)   F stars
E)   K starsF) A) and B)
G) A) and D)

Question 7

Remember Kepler's third law, which relates the period of revolution to the average distance to a planet.   How do we modify that law to use with binary stars?

Accepted Answer

A)   Add the total mass of the two stars.
B)   Add Newton's Law of Gravitation.
C)   Add Einstein's Law of Relativity.
D)   Add the difference of their masses.
E)   Add the distance between the two stars.F) C) and E)
G) C) and D)

Question 8

The Balmer series of hydrogen absorption lines in stars is located in what part of the electromagnetic spectrum?

Accepted Answer

A)   gamma ray region
B)   ultraviolet region
C)   visible region
D)   infrared region
E)   microwave regionF) A) and E)
G) D) and E)

Question 9

The sloped lines from top left to bottom right in the accompanying figure are labeled ____.

Accepted Answer

A)   temperature
B)   radius
C)   apparent magnitude
D)   absolute magnitude
E)   massF) None of the above
G) A) and E)

Question 10

Which star has the largest diameter?

Accepted Answer

A)   white dwarf
B)   main sequence
C)   red giant
D)   supergiant
E)   regular giantF) B) and D)
G) B) and E)

Question 11

The Hertzsprung-Russell Diagram is a plot for stars using absolute magnitude versus temperature.

Accepted Answer

A) True 
 B)False

Question 12

In the accompanying figure, which region represents stars that are extremely bright and emit most of their radiation as ultraviolet light? Note: (C) represents the entire main sequence while (D) and (E) represent only small parts of the main sequence?

Accepted Answer

The answer of  
In the accompanying figure, which region...

Question 13

All stars produce an absorption spectra.

Accepted Answer

A) True 
 B)False

Question 14

Which star has the highest density (mass per unit volume) ?

Accepted Answer

A)   white dwarf
B)   main sequence
C)   supergiant
D)   red giant
E)   regular giantF) A) and D)
G) None of the above

Question 15

The horizontal axis in the accompanying figure is labeled _____.

Accepted Answer

A)   temperature
B)   radius
C)   apparent magnitude
D)   absolute magnitude
E)   luminosityF) C) and D)
G) C) and E)

Question 16

S tars of low luminosity will always have large positive absolute magnitude.

Accepted Answer

A) True 
 B)False

Question 17

The most common stars are _______________ stars.

Accepted Answer

lower-main...

Question 18

Explain why it would be better to obtain stellar parallax for stars if we could observe from the planet Mars instead of the Earth.

Accepted Answer

Observing from Mars would give us a long...

Question 19

The stellar parallax limit for ground-based telescopes is accurate for stars closer than ____.

Accepted Answer

A)   10 parsecs
B)   50 parsecs
C)   100 parsecs
D)   200 parsecs
E)   500 parsecsF) D) and E)
G) None of the above

Question 20

The luminosity class is assigned to a star by studying the absorption lines in the spectrum of the star.

Accepted Answer

A) True 
 B)False

Exam 9: The Family of Stars

The Hertzsprung-Russell Diagram is a plot for stars using absolute magnitude versus temperature.

Correct AnswerverifiedShow Answer

In the accompanying figure, which region represents stars that are extremely bright and emit most of their radiation as ultraviolet light? Note: (C) represents the entire main sequence while (D) and (E) represent only small parts of the main sequence?

Correct AnswerverifiedShow Answer

The Balmer series of hydrogen absorption lines in stars is located in what part of the electromagnetic spectrum?

Correct AnswerverifiedShow Answer

S tars of low luminosity will always have large positive absolute magnitude.

Correct AnswerverifiedShow Answer

A star has a parallax angle of 0.019 seconds of arc. How far away is this star from Earth?

Correct AnswerverifiedShow Answer

In which spectral sequence are the hottest stars categorized?

Correct AnswerverifiedShow Answer

Th e apparen t magnitud e o f a sta r observe d fro m a distanc e o f 1 0 pc is called _____.

Correct Answerverifiedabsolute v...View AnswerShow Answer

Explain why it would be better to obtain stellar parallax for stars if we could observe from the planet Mars instead of the Earth.

Correct AnswerverifiedObserving from Mars would give us a long...View AnswerShow Answer

The sloped lines from top left to bottom right in the accompanying figure are labeled ____.

Correct AnswerverifiedShow Answer

Which star has the highest density (mass per unit volume) ?

Correct AnswerverifiedShow Answer

The luminosity class is assigned to a star by studying the absorption lines in the spectrum of the star.

Correct AnswerverifiedShow Answer

The horizontal axis in the accompanying figure is labeled _____.

Correct AnswerverifiedShow Answer

Recent discoveries of two types of brown dwarfs have placed these stars near which spectral type of star?

Correct AnswerverifiedShow Answer

All stars produce an absorption spectra.

Correct AnswerverifiedShow Answer

If luminosity depends on radius and temperature, what does flux depend on? _______________

Correct AnswerverifiedShow Answer

The most common stars are _______________ stars.

Correct Answerverifiedlower-main...View AnswerShow Answer

Which star has the largest diameter?

Correct AnswerverifiedShow Answer

Recently discovered brown dwarfs have spectra similar to cool O-type stars.

Correct AnswerverifiedShow Answer

Remember Kepler's third law, which relates the period of revolution to the average distance to a planet. How do we modify that law to use with binary stars?

Correct AnswerverifiedShow Answer

The stellar parallax limit for ground-based telescopes is accurate for stars closer than ____.

Correct AnswerverifiedShow Answer

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absolute v...
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Observing from Mars would give us a long...
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lower-main...
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