Exam 16: Basic Properties of Stars

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Visual wavelength absorption lines of hydrogen are very weak in cool stars like red dwarfs.The Lyman lines of hydrogen involve transitions from the ground state to the first excited state.What would you say about the strength of the Lyman lines in red dwarfs?

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Question 41

If we choose a typical star in the vicinity of the Sun,it will be a

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Question 42

What kind of stars are found scattered across the top of the H-R diagram?

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Question 43

Star A is twice as hot as star B.The two stars have the same radius.How does the luminosity of star A compare to that of star B?

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Question 44

What spectral class is found between O and A?

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Question 45

Which of the following spectral classes is coolest?

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Question 46

The spectral classification scheme,OBAFGKM,is correctly interpreted as a sequence in stellar

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Question 47

Suppose we observe a hot,tenuous gas with a cooler "black body" behind it.The combined spectrum will be

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Question 48

The spectral class of a star is a measure of the star's

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Question 49

How do the Sun,a white dwarf,and a red giant rank in descending order of luminosity?

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Question 50

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Visual wavelength absorption lines of hydrogen are very weak in cool stars like red dwarfs.The Lyman lines of hydrogen involve transitions from the ground state to the first excited state.What would you say about the strength of the Lyman lines in red dwarfs?

If we choose a typical star in the vicinity of the Sun,it will be a

What kind of stars are found scattered across the top of the H-R diagram?

Star A is twice as hot as star B.The two stars have the same radius.How does the luminosity of star A compare to that of star B?

What spectral class is found between O and A?

Which of the following spectral classes is coolest?

The spectral classification scheme,OBAFGKM,is correctly interpreted as a sequence in stellar

Suppose we observe a hot,tenuous gas with a cooler "black body" behind it.The combined spectrum will be

The spectral class of a star is a measure of the star's

How do the Sun,a white dwarf,and a red giant rank in descending order of luminosity?

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