Spectroscopic Binary

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spectroscopic binary: see binary star binary star or binary system, pair of stars that are held together by their mutual gravitational attraction and revolve about their common center of mass.
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a binary star whose component stars are so close together that they cannot be seen separately with even the most powerful telescopes. A spectroscopic binary can be distinguished from a single star only by observing periodic shifts or doubling of the binary’s spectral lines. This shift or doubling is caused by the Doppler effect, which results from the orbital motion of the component stars.

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