...While the stars in general appear to travel independently of one another, except when they are combined in binary or trinary systems, there are notable exceptions to this rule... 
Garrett Serviss 「Curiosities of the Sky」
...All these threeclasses of binary systems are now known to be very numerous...
E. Walter Maunder 「Are the Planets Inhabited?」
...The uncertainty with regard to the controlling influenceof gravity was removed by Herschel when he made his important discoveryof binary star systems...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...Other binary stars have had different periods assigned tothem; eleven pairs have been computed to revolve round each other inless than fifty years, and fifteen in less than 100 but more than fifty...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...Our knowledge of binary star systems brings us to what may be regardedas the threshold of the fabric of the heavens...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...They vary in number from three to half a dozen or more,and form systems of a more complex character than what are observed inthe case of binary stars...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...the primary andsecondary of a binary system are each resolvable into two, forming twopairs, each pair being in mutual revolution, while they both gravitateround their common centre of gravity...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...This has been actually shownto be true in many binary stars; it is believed to be true in all...
Robert Stawell Ball 「The Story of the Heavens」
...A pairing of stars in this way, though often casually alluded toas a double star, is properly termed a "binary," or binary system...
Cecil G. Dolmage 「Astronomy of To-day」
...The method of detecting binary stars by means of the spectroscope is anapplication of Doppler's principle...
Cecil G. Dolmage 「Astronomy of To-day」
...Sirius is also a binary system;but it is what is called a "visual" one, for its component stars may beseen separately in very large telescopes...
Cecil G. Dolmage 「Astronomy of To-day」
...Procyon is also a binary, its companion having been discovered byProfessor J...
Cecil G. Dolmage 「Astronomy of To-day」
...—In addition to thesethere is a certain further number of binary variables inwhich both components are bright and where the variationof brightness follows a very different course...
George C. Comstock 「A Text-Book of Astronomy」
...The period of this binary seems to be about 750years...
Richard A. Proctor 「Half-hours with the Telescope」
...It appears to be a binary, but the motion is veryslow, and nothing certain is yet known of its period...
Garrett Serviss 「Pleasures of the telescope」
...This is a long-period binary, and notwithstandingthe closeness of its stars, our four-inch should separatethem when the seeing is fine...
Garrett Serviss 「Pleasures of the telescope」
...Much more interesting, however, is 70, a binary whosecomponents have completed a revolution since theirdiscovery by Sir William Herschel, the period beingninety-five years...
Garrett Serviss 「Pleasures of the telescope」
...Later he said: “I adhere to the conviction thatProcyon and Sirius form real binary systems, consisting of a visible and aninvisible star...
George Forbes 「History of Astronomy」
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