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physical object > natural object > celestial body > collection of stars > star system > binary star > spectroscopic binary > double line spectroscopic binary

double line spectroscopic binary comparison table

Subject	be used a	is a kind of	has definition
spectroscopic binary		binary star	Star whose binary nature can be detected from the periodic Doppler shifts of their spectra, owing to their varying velocities in the line of sight. Double-lined spectroscopic binaries have two sets of spectral features, oscillating with opposite phases. Single-lined spectroscopic binaries have only one set of oscillating spectral lines, owing to the dimness of the secondary component. Spectroscopic binaries are typically of spectral type B, with almost circular orbits (whereas long-period M-type binaries have highly eccentric orbits).
double line spectroscopic binary	a distance measuring technique	spectroscopic binary	a spectroscopic binary in which periodic Doppler shift is detected in both components of the binary star each out of phase by 180 degrees

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