Stars and telescopes; a hand-book of popular astronomy, founded on the 9th ed. of Lynn's Celestial motions (1899)
Todd, David P. (David Peck), 1855-1939, Lynn, William Thynne, 1835-1911. Celestial motions · Boston, Little, Brown and company · leaf 341
combinations of two stars, intimately held together bythe bond of mutual attraction/ These, then, are calledbinary stars, to distinguish them from such as are onlyoptically double ; and the discoveries of binary sys-tems, or stars physically double, is constantly increas-ing. The high interest… … F. G. W. STRUVE (1793-1864) 3,134 double stars was published at Saint Petersburgin 1837, containing the results of his observations atDorpat and Pulkowa. Many of the binary stars have a regular orbital revolution,the most interesting casesbeing £ Herculis, £ UrsaeMajoris, and 70 Ophiuchi,whose…
Astronomy
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