double star


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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 star

A 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.

double star

[¦dəb·əl ′stär]
(astronomy)
A star which appears as a single point of light to the eye but which can be resolved into two points by a telescope.
References in periodicals archive ?
The tracking feature was then re-enabled and the process was repeated five times for each double star and the resulting position angles were averaged.
The other clusters and double stars marked on the map are described in the table above.
A total occultation report was submitted to Jan Manek (IOTA occultations regional coordinator for Europe) and a double star report to Brian Loader (IOTA double star coordinator).
The ASSA Double Star Section, formed in 1999, aims to: encourage amateur astronomers worldwide to participate in double star observation; make available information on all aspects of double star observation; and to co-ordinate observations and to publish meaningful results in the interest of science.
In March, Double Star signed an agreement with Kumho tire creditors to buy a 42.
The Johannesburg Centre of ASSA is in the process of renovating the cardex archive of double star measurements going back to 1835.
We knew that this double star was unusual, and that material was flowing from one star to the other," said co-author Henri Boffin, from ESO.
And if you wish to go further and start making measurements of double stars the Deep Sky Section's Double Star adviser John McCue will be more than happy to provide advice and assistance.
Sharp eyes or binoculars will resolve another wide double star, Alpha ([alpha]) Capricorni, at its western end.
84 Key: HR: Number in the Bright Star Catalogue; WDS: Washington Double Star Catalogue number, V: apparent (visual) magnitude of the primary; AV: magnitude difference between primary and secondary.
To quote from the review of the hardcover in KLIATT, July 2002: I would double star this if KLIATT allowed such a thing