Binary Star

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Binary Star

A system of two stars revolving about their barycenter.
The smaller star of the system is referred to as the companion or comes.
Visible binaries are those which can be resolved into two stars by a telescope.
Spectroscopic binaries are those which cannot be resolved by a telescope by show temporary displacement and doubling of the lines in their spectra.

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use