The star β Cephei has recently been discovered to be a spectroscopic binary with the wonderfully short period of 4h 34m 11s.
The calculated masses of spectroscopic binary stars are, therefore, in general only about sixty per cent.
Capella has been found to be a spectroscopic binary; also the pole star.
Prof. Campbell estimates that fully one star in six is a spectroscopic binary.
A star shown to be double by the spectroscope, but not by the telescope, is called a spectroscopic binary star.
This star, which is the Algol variable V Puppis, has been found to be a spectroscopic binary.
See under binary star.