...Thisstar was one of the first discovered and most remarkable"spectroscopic binaries... 
William Tyler Olcott 「A Field Book of the Stars」
...Such connected pairs of stars, since they cannot be seenseparately by means of any telescope, no matter how large, are known as"spectroscopic binaries...
Cecil G. Dolmage 「Astronomy of To-day」
...Most of the spectroscopic binaries appear to be upon a smaller scalethan the telescopic ones...
Cecil G. Dolmage 「Astronomy of To-day」
...Spectroscopic binaries...
George C. Comstock 「A Text-Book of Astronomy」
...
Spectroscopic Binaries...
George Forbes 「History of Astronomy」
...Spectroscopic binaries are probably very numerous...
Cecil G. Dolmage 「Astronomy of To-day」
...The bright star Capella is an excellent illustration ofthese spectroscopic binaries...
George C. Comstock 「A Text-Book of Astronomy」
...Spectroscopic binaries agree with ordinary double starsin having masses rather greater than that of the sun, butthere is as yet no assured case of a mass ten times as greatas that of the sun...
George C. Comstock 「A Text-Book of Astronomy」
...—It must not besupposed that all variable stars are binaries which eclipseeach other...
George C. Comstock 「A Text-Book of Astronomy」
...The assemblage of close binaries in this neighborhoodis very curious...
Garrett Serviss 「Pleasures of the telescope」
...It should also show itself in the measures of allspectroscopic binaries...
Edward C. Pickering 「The Future of Astronomy」
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