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spectroscopic binary

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noun Astronomy.
  1. a binary star having components that are not sufficiently separated to be resolved by a telescope, known to be a binary only bythe variations in wavelength of emitted light that are detected by a spectroscope.
Compare visual binary.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
spectroscopic binary in Science

spectroscopic binary

[spĕk′trə-skŏpĭk]
  1. See under binary star.
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