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.
9[degrees] north-northwest of bright Zeta ([zeta]) Tauri for the handsome 7th-magnitude double star Struve 742 ([summation]742), which is easily split at 100x.
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.
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.
Bright southern double stars HR WDS RA Dec 531 01496-1041 01h 49m 57.
For one, unequal double stars must be wider to be resolved with the same telescope, sometimes much wider (see the box on page 31).
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.
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.
Sharp eyes or binoculars will resolve another wide double star, Alpha ([alpha]) Capricorni, at its western end.
Bright southern double stars HR WDS RA Dec Designation 531 01496-1041 01h 49m 57.
We really don't have any idea right now about what kinds of planets form around double stars or even if planets can form around double stars," Kastner said.