Optical Double

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Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke5392.&link_type=abstract

"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 5392. Bristol: Institute of Physics Publishing, 2001

Astronomy and Astrophysics

Astrophysics

Stars, Binary Stars

Scientific paper

This term is used for an observed double star that consists of two quite unrelated stars which just happen to lie in almost the same line of sight, and therefore appear to be close together in the sky. They may in fact be at very different distances from us and each other. If one of the stars is sufficiently close to have a measurable parallax, the true nature of the system can be quickly establi...

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