Download Activity 22: Determining Ages of Star Clusters

Activity 22: Determining Ages of Star Clusters
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Post-22.1: Recall Wien’s law and apply it to mainsequence stars. What is the relationship between the
color of a star and its surface temperature?
a. A blue main sequence star is hotter than a red
main sequence star.
b. A blue main sequence star is cooler than a red
main sequence star.
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Post-22.1: Recall Wien’s law and apply it to mainsequence stars. What is the relationship between the
color of a star and its surface temperature?
a. A blue main sequence star is hotter than a red
main sequence star.
b. A blue main sequence star is cooler than a red
main sequence star.
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Post-22.2: What is the relationship between the color of
a star and its luminosity?
a. A blue main-sequence star has a higher
luminosity than a red main-sequence star.
b. A blue main-sequence star has a lower
luminosity than a red main-sequence star.
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Post-22.2: What is the relationship between the color of
a star and its luminosity?
a. A blue main-sequence star has a higher
luminosity than a red main-sequence star.
b. A blue main-sequence star has a lower
luminosity than a red main-sequence star.
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Post-22.3: What conclusion can you draw between the
color of a star and its lifetime on the main sequence?
a. A blue main-sequence star has a longer lifetime
than a red main-sequence star.
b. A blue main-sequence star has a shorter lifetime
than a red main-sequence star.
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Post-22.3: What conclusion can you draw between the
color of a star and its lifetime on the main sequence?
a. A blue main-sequence star has a longer lifetime
than a red main-sequence star.
b. A blue main-sequence star has a shorter lifetime
than a red main-sequence star.
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Post-22.4: Study the two color-magnitude diagrams
shown in the figure below. Which cluster is older?
a. NGC 1960
b. NGC 2355
c. More information is needed.
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Post-22.4: Study the two color-magnitude diagrams
shown in the figure below. Which cluster is older?
a. NGC 1960
b. NGC 2355
c. More information is needed.
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Post-22.5: The color-magnitude diagram for NGC 1817
is shown in the figure below. What is the approximate
age for this open cluster?
a. 8 million years
b. 8 billion years
c. 8 trillion years
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Post-22.5: The color-magnitude diagram for NGC 1817
is shown in the figure below. What is the approximate
age for this open cluster?
a. 8 million years
b. 8 billion years
c. 8 trillion years
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Post-22.6: Which letter identifies the main sequence?
a.
b.
c.
d.
e.
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A
B
C
D
E
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Post-22.6: Which letter identifies the main sequence?
a.
b.
c.
d.
e.
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A
B
C
D
E
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Post-22.7: Which letter identifies the main-sequence
turnoff?
a.
b.
c.
d.
e.
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A
B
C
D
E
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Post-22.7: Which letter identifies the main-sequence
turnoff?
a.
b.
c.
d.
e.
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A
B
C
D
E
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Post-22.8: Which letter identifies the subgiant branch?
a.
b.
c.
d.
e.
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A
B
C
D
E
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Post-22.8: Which letter identifies the subgiant branch?
a.
b.
c.
d.
e.
©2014 W.W.Norton &Company, Inc.
A
B
C
D
E
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Post-22.9: Which letter identifies the red giant branch?
a.
b.
c.
d.
e.
©2014 W.W.Norton &Company, Inc.
A
B
C
D
E
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Post-22.9: Which letter identifies the red giant branch?
a.
b.
c.
d.
e.
©2014 W.W.Norton &Company, Inc.
A
B
C
D
E
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Post-22.10: Which letter identifies the white dwarfs?
a.
b.
c.
d.
e.
©2014 W.W.Norton &Company, Inc.
A
B
C
D
E
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Post-22.10: Which letter identifies the white dwarfs?
a.
b.
c.
d.
e.
©2014 W.W.Norton &Company, Inc.
A
B
C
D
E
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This concludes Activity 22: Determining Ages of
Star Clusters
©2014 W.W.Norton &Company, Inc.
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