A DOUBLE‐STAR SYSTEM consists of two separate stars that orbit about the center of mass of the system much as a planet orbits the sun. For the most part, these double‐star systems appear as single points of light, even with the aid of a telescope. Nevertheless, there is evidence that a large fraction of all the single points we see are really double‐star systems.
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P. van de Kamp, p. 223 in Encyclopedia of Physics, Vol. 1 (ed. by S. Flugge), Springer‐Verlag, Berlin (1958).
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R. Aitken, The Binary Stars, McGraw‐Hill, New York (1935).
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L. Binnendijk, Properties of Double Stars, University of Pennsylvania Press, Philadelphia (1960).
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Z. Kopal, Close Binary Systems, Chapman and Hall, London (1959).
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J. M. A. Danby, Fundamentals of Celestial Mechanics, Macmillan, New York (1962).
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© 1967 American Institute of Physics.
1967
American Institute of Physics
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