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spectroscopic companion




A companion star, brown dwarf, or planet, the presence of which is inferred by the effect it produces on the spectral lines of the primary. As the companion revolves around the primary it causes the latter to approach and recede alternately along the line of sight. This, in turn, results in a small periodic Doppler shift in the primary's spectrum.


Related entry

   • radial velocity method


Related category

   • TYPES OF STARS