Visual Binary Star - A pair of stars orbiting a common center of mass in which the images of the components can be distinguished using a telescope and which have detectable orbital motion ...
visual binary stars
Binary stars that are identified visually, that is, observers can see two stars orbiting each other.
A visual binary star system in the constellation Cancer consisting of a middle-aged, Sun-like primary of high metallicity, 55 Cancri A, and a red dwarf companion, 55 Cancri B. (55 Cancri is the star's Flamsteed designation.
^ a b c d Entry, WDS identifier 00084+2905, Sixth Catalog of Orbits of Visual Binary Stars, William I. Hartkopf & Brian D. Mason, U.S. Naval Observatory. Accessed on line August 12, 2008.
Mason, Sixth Catalog of Orbits of Visual Binary Stars, U. S, Naval Observatory.)
Though not within Bootes' classical outline, the star is easily found about nine degrees due east of Arcturus. Both members of the binary are hydrogen-fusing dwarfs.
Norlund, this companion has been cited by the Sixth Catalog of Orbits of Visual Binary Stars as being separated "on average" from Star Aa by a semi-major axis of 0.054", which may be a misinterpretation of Heintz (1996).
The brightest star in Norma is [5717]-[5710] gamma Normae, a visual binary star composed of a F9 supergiant and a somewhat brighter G8 giant, approximately 128 light-years distant.
Visual Binary: Binary systems in which both components can be seen are called visual binary stars. However, not all stars apparently close together are gravitationally connected, they could be actually at different distances from the observer.
Visual binary stars have a large true separation, and consequently usually have orbital speeds too small to be measured spectroscopically from far away.
For example, when Ernst Öpik estimated the density of a number of visual binary stars in 1916, he found that 40 Eridani B had a density of over 25,000 times the Sun's, which was so high that he called it "impossible".
An instrument that permits precise measurements at the telescope of the position of visual binary stars and similar objects.
Filtergrams ...
The Fourier transformation of a distant radio source, normalized to its value at small antenna spacings. [H76]
Visual Binary Star
see Binary System.
Visual Magnitude ...
Aldebaran is a visual binary star and an irregular variable star, with magnitude ranging from 0.78 to 0.93. Its distance is 68 light-years. The name is from the Arabic meaning "follower (of the Pleiades)." ...
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144. Filar Micrometer
An instrument that permits precise measurements at the telescope of the position of visual binary stars and similar objects.
 See also: Visual Binary, Binary star, Star, Distance, Light
  
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