I Am Measuring the Spectrum of the Stars in a Spectroscopic

question 17

Multiple Choice

I am measuring the spectrum of the stars in a spectroscopic binary system. When one of the stars is moving toward the Earth in its orbit, we observe

• A) that the lines in its spectrum get brighter
• B) that the lines in its spectrum merge with the lines of the other star
• C) that it is no longer possible to learn what elements are in the star
• D) that the lines in its spectrum show a blue-shift
• E) none of the above

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