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Related to double star: Optical double star
double star:see binary starbinary star
or binary system,
pair of stars that are held together by their mutual gravitational attraction and revolve about their common center of mass. In 1650 Riccioli made the first binary system discovery, that of the middle star in the Big Dipper's handle, Zeta
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double starA pair of stars that appear close together in the sky. There are two types: optical double stars and physical double stars. Stars in an optical double, such as Deneb, appear close only because they happen to lie in very nearly the same direction from Earth; they are actually too far apart to be members of a dynamically linked system. Stars in a physical double are sufficiently close together for their motions to be affected by their mutual gravitational attraction. They are more usually known as visual binaries.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
double star[¦dəb·əl ′stär]
A star which appears as a single point of light to the eye but which can be resolved into two points by a telescope.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.