The Object You Are Observing Through a Telescope Appears Visually

question 244

Multiple Choice

The object you are observing through a telescope appears visually to be a single star,but you know by looking at its spectrum that it is a binary system.Which spectral feature might NOT characterize it as a binary?

• A) The spectrum includes spectral lines associated with two different spectral types.
• B) The sets of spectral lines move periodically to slightly higher frequencies and then slightly lower frequencies.
• C) As the lines from one spectral type are moving toward higher frequencies, the lines from the other spectral type are moving toward lower frequencies.
• D) The spectral lines from one spectral type become periodically brighter, while the lines from the other spectral type become dimmer.

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