Question 1

Any star that is more luminous than the Sun, but has the same temperature as the Sun, is a(n)  ____.

Accepted Answer

A)   pulsating star
B)   white dwarf
C)   zero age main sequence star
D)   giant
E)   brown dwarfF) A) and B)
G) A) and C)

Question 2

Determine the mass of a theorized black hole from the following information. The mass of the companion main sequence star is 6 solar masses. The observed period and semi-major axis of the binary system are 3.5 years and 5.5 AUs, respectively.

Accepted Answer

The answer of Determine the mass of a theorized black...

Question 3

In the above, which figure represents stars with the longest main-sequence lifetimes? 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 above, which figure represents...

Question 4

The Sun is what spectral type?

Accepted Answer

A)   S2
B)   G2
C)   F2
D)   K2
E)   ST2 (Spectral Type 2) F) B) and C)
G) C) and D)

Question 5

One type of binary star is _______________ binary.

Accepted Answer

visual,spectroscopic,eclipsing

Question 6

If two stars are emitting the same amount of light, the star that is farther will appear dimmer.

Accepted Answer

A) True 
 B)False

Question 7

In the accompanying figure, which region represents white dwarfs? 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 8

The hydrogen lines of spectral type A main sequence stars are ____.

Accepted Answer

A)   the strongest
B)   the weakest
C)   the most narrow
D)   useful in determining apparent magnitude
E)   used to estimate the luminosity of the starF) D) and E)
G) A) and E)

Question 9

The least common stars are _______________ stars.

Accepted Answer

upper-main...

Question 10

In the accompanying figure, which region represents the largest diameter stars? 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 11

The most common type of star is a(n)  ____.

Accepted Answer

A)   white dwarf
B)   lower-main-sequence star
C)   upper-main-sequence star
D)   giant
E)   supergiantF) D) and E)
G) A) and C)

Question 12

The classification of stellar spectra started with the amount of hydrogen in the star's spectrum; however, now a better scheme uses the star's _____.

Accepted Answer

A)   mass
B)   diameter
C)   radius
D)   temperature
E)   luminosityF) A) and E)
G) None of the above

Question 13

Absolute visual magnitude is calculated at a standard distance of ____.

Accepted Answer

A)   one light year
B)   one parsec
C)   10 light years
D)   10 parsecs
E)   100 parsecsF) None of the above
G) C) and E)

Question 14

Explain the difference between apparent visual brightness and absolute visual brightness.

Accepted Answer

Apparent visual brightness is the perceived energy we see from the Earth without consideration of distance; whereas absolute visual brightness is the energy we receive if the star was at a distance of 10 parsecs.

Question 15

How did astronomers discover the relationship between spectral type and mass for main sequence stars?

Accepted Answer

A)   by measuring stellar radii with very powerful optical telescopes
B)   by measuring stellar radii with very powerful radio telescopes
C)   by comparing stars with the same spectral type but different luminosities
D)   by using computer models of hydrogen fusion and stellar structure
E)   by measuring the masses and spectral types of main-sequence stars in binary systemsF) All of the above
G) A) and B)

Question 16

In the accompanying figure, which region represents stars that have ceased ongoing nuclear fusion? 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 17

Veg a i s a n A 0 main sequence star . Base d o n thi s informatio n, whic h statement is true?

Accepted Answer

A)   Vega has a surface temperature that is less than the Sun
B)   Vega has mass that is greater than the Sun
C)   Vega is less luminous than the Sun
D)   Vega has mass that is less than the Sun
E)   Vega is located near the lower right hand corner on the HR diagramF) A) and B)
G) A) and C) B

Question 18

Hydrogen lines are weak in the spectra of hot O-type stars because ____.

Accepted Answer

A)   most of the hydrogen has been converted to helium
B)   a good spectrum of these stars is difficult to obtain
C)   these stars have no atmosphere
D)   gravitational pressure pushes all the hydrogen lines out of the visible spectrum
E)   most of the hydrogen is ionized to high energy levelsF) All of the above
G) B) and D)

Question 19

Briefly state or explain the mass-luminosity relation for stars.

Accepted Answer

The luminosity of a star is di...

Question 20

Star B has an apparent visual magnitude of +5 and is at a distance of 330 pc.   What is the absolute visual magnitude of Star B?

Accepted Answer

The answer of Star B has an apparent visual magnitude...

Exam 9: The Family of Stars

Any star that is more luminous than the Sun, but has the same temperature as the Sun, is a(n) ____.

Correct AnswerverifiedShow Answer

Determine the mass of a theorized black hole from the following information. The mass of the companion main sequence star is 6 solar masses. The observed period and semi-major axis of the binary system are 3.5 years and 5.5 AUs, respectively.

Correct AnswerverifiedShow Answer

In the above, which figure represents stars with the longest main-sequence lifetimes? Note: (C) represents the entire main sequence while (D) and (E) represent only small parts of the main sequence.

Correct AnswerverifiedShow Answer

The Sun is what spectral type?

Correct AnswerverifiedShow Answer

One type of binary star is _______________ binary.

Correct Answerverifiedvisual,spectroscopic,eclipsing

If two stars are emitting the same amount of light, the star that is farther will appear dimmer.

Correct AnswerverifiedShow Answer

In the accompanying figure, which region represents white dwarfs? Note: (C) represents the entire main sequence while (D) and (E) represent only small parts of the main sequence.

Correct AnswerverifiedShow Answer

The hydrogen lines of spectral type A main sequence stars are ____.

Correct AnswerverifiedShow Answer

The least common stars are _______________ stars.

Correct Answerverifiedupper-main...View AnswerShow Answer

In the accompanying figure, which region represents the largest diameter stars? Note: (C) represents the entire main sequence while (D) and (E) represent only small parts of the main sequence.

Correct AnswerverifiedShow Answer

The most common type of star is a(n) ____.

Correct AnswerverifiedShow Answer

The classification of stellar spectra started with the amount of hydrogen in the star's spectrum; however, now a better scheme uses the star's _____.

Correct AnswerverifiedShow Answer

Absolute visual magnitude is calculated at a standard distance of ____.

Correct AnswerverifiedShow Answer

Explain the difference between apparent visual brightness and absolute visual brightness.

Correct AnswerverifiedApparent visual brightness is the perceived energy we see from the Earth without consideration of distance; whereas absolute visual brightness is the energy we receive if the star was at a distance of 10 parsecs.

How did astronomers discover the relationship between spectral type and mass for main sequence stars?

Correct AnswerverifiedShow Answer

In the accompanying figure, which region represents stars that have ceased ongoing nuclear fusion? Note: (C) represents the entire main sequence while (D) and (E) represent only small parts of the main sequence.

Correct AnswerverifiedShow Answer

Veg a i s a n A 0 main sequence star . Base d o n thi s informatio n, whic h statement is true?

Correct AnswerverifiedB

Hydrogen lines are weak in the spectra of hot O-type stars because ____.

Correct AnswerverifiedShow Answer

Briefly state or explain the mass-luminosity relation for stars.

Correct AnswerverifiedThe luminosity of a star is di...View AnswerShow Answer

Star B has an apparent visual magnitude of +5 and is at a distance of 330 pc. What is the absolute visual magnitude of Star B?

Correct AnswerverifiedShow Answer

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visual,spectroscopic,eclipsing

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upper-main...
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Apparent visual brightness is the perceived energy we see from the Earth without consideration of distance; whereas absolute visual brightness is the energy we receive if the star was at a distance of 10 parsecs.

Correct Answer
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B

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The luminosity of a star is di...
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