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double star
double star Two stars that appear close to one another on the sky. Such pairs may be divided into two classes: optical doubles, where the components are not gravitationally bound; and physical doubles, in which the stars are orbiting their common barycentre. The term ‘double star’ is often restricted to the former group, and the term binary star is used for the latter. In fact, optical doubles are relatively uncommon, and the majority of doubles are actually true binary systems.
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"double star." A Dictionary of Astronomy. 1997. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>. "double star." A Dictionary of Astronomy. 1997. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1O80-doublestar.html "double star." A Dictionary of Astronomy. 1997. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-doublestar.html |
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double star
double star Two stars that appear close together in the sky. There are two types of double star: binary stars and optical doubles (two stars that are quite distant from each other, but appear close together as a result of chance alignment).
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"double star." World Encyclopedia. 2005. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>. "double star." World Encyclopedia. 2005. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1O142-doublestar.html "double star." World Encyclopedia. 2005. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O142-doublestar.html |
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double star
double star see binary star . |
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Cite this article
"double star." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>. "double star." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1E1-X-doublest.html "double star." The Columbia Encyclopedia, 6th ed.. 2011. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-X-doublest.html |
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