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Dictionary

spec'troscop'ic bi'nary

Astron.
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. Cf. visual binary.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

spectroscope

spectroscopy

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