Question 1

If a star has an apparent magnitude of +5 and an absolute magnitude of -10, what can we say about that star?

Accepted Answer

A)   The star is farther than 10 parsecs away.
B)   The star is closer than 10 parsecs away.
C)   The star has a very large chromosphere.
D)   The star has a very large corona.
E)   The star is fainter than the Sun.

Question 2

Explain why the current spectral classification letters are all jumbled and not in alphabetical order.

Accepted Answer

The spectral classification sequence ori...

Question 3

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)   mass

Question 4

The Hertzsprung-Russell diagram can be labeled many different ways. Which coordinates CANNOT be used on an H-R diagram?

Accepted Answer

A)   luminosity versus spectral type
B)   luminosity versus temperature
C)   radius versus temperature
D)   absolute magnitude versus temperature
E)   luminosity versus color

Question 5

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 levels

Question 6

The spectral classification of stars started with the amount of hydrogen present in their spectra, but a better method now uses the amount of oxygen in the star's spectra.

Accepted Answer

A) True 
 B)False

Question 7

Which star has the largest diameter?

Accepted Answer

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

Question 8

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

A)   A
B)   B
C)   C
D)   D
E)   E

Question 9

In the accompanying figure, which region represents approximately 80 percent of normal stars? Note: (C)  represents the entire main sequence while (D)  and (E)  represent only small parts of the main sequence.

Accepted Answer

A)   A
B)   B
C)   C
D)   D
E)   E

Question 10

Careful measurements reveal that a star maintains a steady apparent brightness at most times, except that at precise intervals of 93 hours. the star becomes dimmer for about 2 hours. The most likely explanation for this is that the star ________.

Accepted Answer

A)   has a very large "sunspot" on its surface
B)   is a member of an eclipsing binary star system
C)   is a white dwarf
D)   is a Cepheid variable
E)   is periodically ejecting gas into space, every 93 hours

Question 11

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...

Question 12

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 stars

Question 13

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

A)   A
B)   B
C)   C
D)   D
E)   E

Question 14

A star's absolute visual magnitude depends only on the star's ______ and _____.

Accepted Answer

A)   temperature; mass
B)   diameter; mass
C)   temperature; density
D)   diameter; density
E)   distance; magnitude

Question 15

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

Accepted Answer

A) True 
 B)False

Question 16

The Sun is what spectral type?

Accepted Answer

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

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 diagram

Question 18

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)   supergiant

Question 19

One type of binary star is _______________ binary.

Accepted Answer

visual,spe...

Question 20

On the H-R diagram, lines of constant radius are illustrated as _____.

Accepted Answer

A)   sloping downward from right to left
B)   sloping downward from left to right
C)   running vertically on the right side
D)   running horizontally on the top
E)   moving in various direction depending on the type of star

Exam 9: The Family of Stars

Explain why the current spectral classification letters are all jumbled and not in alphabetical order.

Correct AnswerverifiedThe spectral classification sequence ori...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

If a star has an apparent magnitude of +5 and an absolute magnitude of -10, what can we say about that star?

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

In the accompanying figure, which region represents approximately 80 percent of normal stars? Note: (C) represents the entire main sequence while (D) and (E) represent only small parts of the main sequence.

Correct AnswerverifiedShow Answer

Careful measurements reveal that a star maintains a steady apparent brightness at most times, except that at precise intervals of 93 hours. the star becomes dimmer for about 2 hours. The most likely explanation for this is that the star ________.

Correct AnswerverifiedShow Answer

One type of binary star is _______________ binary.

Correct Answerverifiedvisual,spe...View AnswerShow Answer

A star's absolute visual magnitude depends only on the star's ______ and _____.

Correct AnswerverifiedShow Answer

On the H-R diagram, lines of constant radius are illustrated as _____.

Correct AnswerverifiedShow 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

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

Correct AnswerverifiedShow Answer

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

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

In which spectral sequence are the hottest stars categorized?

Correct AnswerverifiedShow Answer

The Hertzsprung-Russell diagram can be labeled many different ways. Which coordinates CANNOT be used on an H-R diagram?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The Sun is what spectral type?

Correct AnswerverifiedShow Answer

Which star has the largest diameter?

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 AnswerverifiedShow Answer

The spectral classification of stars started with the amount of hydrogen present in their spectra, but a better method now uses the amount of oxygen in the star's spectra.

Correct AnswerverifiedShow Answer

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The spectral classification sequence ori...
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visual,spe...
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A star's absolute visual magnitude depends only on the star's __ and _.

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