An Astronomer Looks Through a Telescope and Identifies a Source

question 164

Multiple Choice

An astronomer looks through a telescope and identifies a source that appears visually to be a single star. However, the source is later determined to be a binary system looking at its spectrum. Which of these spectral features would 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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