Question 1

If a star's spectrum does not contain spectral lines characteristic of a certain element, can we conclude that the star does not contain that element? Why or why not?

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Question 2

How does density divide the stars in the H-R diagram into three groups?

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Question 3

What information about orbital inclination can we get from visual binaries, spectroscopic binaries, and eclipsing binaries?

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Question 4

​ Which are the most common stars, massive stars or low-mass stars (relative to the Sun)?  High luminosity or low luminosity (relative to the Sun)?

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Question 5

How do astronomers know that the newly found L and T spectral types represent objects cooler than M spectral class?

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Question 6

Why are the Balmer lines weak in the spectra of hot and cool stars, but strong in the spectra of intermediate-temperature stars?

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Question 7

For what kinds of stars are the masses of stars in the H-R diagram "orderly"? For what kinds of stars are they disorderly? In other words, could you guess the mass of a star from its location (luminosity, temperature) on the H-R diagram?

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Question 8

Why do molecular bands only occur in the spectra of the coolest stars?

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Question 9

What information can we get from eclipsing binaries that we cannot get from visual binaries?

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Question 10

Describe two methods that could be used to determine the temperature of a star.

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Quiz 8: The Family of Stars