Question 1

How does the inclination of a spectroscopic binary star system's orbit affect astronomers' mass estimates of the stars?

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Question 2

Why does luminosity increase with stellar mass on the main sequence?

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Question 3

The Sun is expected to spend about 5 billion more years on the main sequence.If its luminosity increased suddenly to four times its usual value,how much time would it remain on the main sequence?

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Question 4

Draw an HR diagram and sketch the location of the main sequence,red giant branch,and white dwarfs.

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Question 5

What is the name for the force balance illustrated in the figure below?

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Question 6

In a typical observation of a globular cluster,90% of the observed stars will lie on the main sequence.What does this tell you about the life cycle of stars?

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Question 7

How do astronomers construct stellar evolutionary tracks on the HR diagram?

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Question 8

All observed stars have roughly the same amount of hydrogen in their atmospheres.Why then are hydrogen lines less prominent in O stars than they are in A stars?

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Question 9

How are globular clusters used to test stellar models?

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Question 10

What aspects of a star change significantly during its time on the main sequence?

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Quiz 11: Measuring the Stars: the Main Sequence and Its Meaning