binary star(redirected from Invisible companion)
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A system of two stars bound together by gravity and orbiting a common center of mass, most often appearing as a single star when visible to the unaided eye. Also called double star.
(Astronomy) a double star system comprising two stars orbiting around their common centre of mass. A visual binary can be seen through a telescope. A spectroscopic binary can only be observed by the spectroscopic Doppler shift as each star moves towards or away from the earth. Sometimes shortened to: binary See also optical double star, eclipsing binary
a system of two stars that revolve about their common center of mass.
A system of two stars that orbit a common center of mass. The pair often appears as a single star to the unaided eye.