double star

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Related to Double stars: Binary stars

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 reticle micrometer, if carefully calibrated, can be a reasonably accurate tool for use in measuring double stars.
W H van den Bos (Gill Medallist 1960) joined the Union Observatory to measure double stars and to search the southern skies for more.
Using predictions from Occult Watcher (1) generated by Occult (2) via a feed from an IOTA-ES add-in, (3) we have successfully monitored a few double star events, which did not indicate any duplicity within the temporal resolution of our recording systems.
The outstanding double star eta Pictoris is situated in the far western part of the constellation--two beautiful magnitude 5 stars dressed up in rich yellow and orange colours.
The first Director of the Observatory was Dr R A Rossiter (ASSA President 1939-40), who made 23,800 measurements of double stars and discovered 5,534 new pairs.
There are so many nice double stars to view its not possible in this space to list many, but I hope this gives a bit of a taster.
In an effort to generate grass roots interest in double stars, the writer has produced a "Double star of the month " column in Canopus, the newsletter of the Johannesburg Centre and positive input has been received from several observers, with Jerome Jooste making a major contribution by imaging most of the double stars discussed.
The joint effort of amateur astronomers and scientists led to the first reported case of a planet orbiting a double star.
Mr Abdul Ahad, in his letter in the December Journal (120(6), 374 (2010)) described his search, conducted bibliographically, for the double star with the greatest colour contrast.
At present the US Naval Observatory is the leader in the field of double star research, and maintains the Washington Double Star Catalogue which currently lists more than 80 000 double stars.
Sill, it is an easily recognisable compilation, with several look-alike double stars and is, famously, a close neighbour to the centre of the Milky Way.
According to Lintott, the human brain would be particularly good at finding any weird or unusual systems involving variable or double stars or multiple interacting planets.