Beta Lyrae variables are a class of close binary stars. Their total brightness is variable because the two component stars orbit each other, and in this orbit one component periodically passes in front of the other one, thereby blocking its light.
Beta Lyrae is called Sheliak, a name that comes from the Arabic for ‘harp', in reference to the constellation as a whole. Beta Lyrae is a celebrated variable star.
Beta Lyrae is a fixed multiple binary, with a primary of 3.5. AB: 3.5. 8.6; 149º, 46"; AE: 9.9, 318º, 67"; AF: 9.9, 19º, 85".
Beta Lyrae system
Delta Lyrae (possibly aka Delta Vega)
Mensa (Mensae) Microscopium (Micropscopii) Monoceros (Monocerotis) Musca (Muscae) ...
[5352] beta Lyrae or Sheliak ("harp") is a binary star composed of two B-type stars that are so close together that it is impossible to resolve them with an optical telescope.
Algol variables undergo eclipses with one or two minima separated by periods of nearly constant light. The prototype of this class is Algol in the constellation Perseus.
Beta Lyrae variables ...
An animation of the Beta Lyrae system, an eclipsing binary including an accretion disc.
The eclipsing double star Sheliak (Beta Lyrae) is the upper right-hand corner of the parallelogram, while Sulafat is at the lower right hand corner.
Star Radius (Solar radii) Density (Solar density) Mass (Solar mass) Supergiants Beta Lyrae
19.2
0.0014 ...
The prototype Lyr (B8.5 II, F V) is a complex eclipsing system and is presently in a state of rapid mass transfer. The spectrum of one companion is invisible; it may be a black hole. Beta Lyrae is also a weak radio source. [H76]
RR Lyrae Stars ...
 See also: Star, Light, Second, Sheliak, Magnitude
  
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