description Beta Lyrae Overview
Beta Lyrae, also called Sheliak, is an eclipsing binary star system in the constellation Lyra. The two stars orbit closely and exchange matter, so their changing shapes, eclipses, and interactions produce regular variations in brightness rather than a simple single-star pulse. Beta Lyrae serves as the prototype of the Beta Lyrae class of variable stars and is studied to understand mass transfer and the evolution of close binary systems.
help Beta Lyrae FAQ
What is Beta Lyrae also called?
Beta Lyrae is traditionally called Sheliak and lies in the constellation Lyra. It is the prototype of the eclipsing binary class known as Beta Lyrae variables.
Why does Beta Lyrae change brightness every 12.9 days?
The system contains two closely orbiting stars that periodically pass in front of one another from Earth's viewpoint. Their orbital period is roughly 12.9 days, producing regular eclipses and changes in apparent brightness.
Does Beta Lyrae contain an accretion disk?
Yes. The two stars exchange mass, and the transferred material forms an accretion disk around the mass-gaining star. NASA research identifies mass transfer as central to the system's observed behavior. [NASA](https://ntrs.nasa.gov/citations/19910066081)
How is Beta Lyrae different from a pulsating variable star?
Its brightness changes mainly because of eclipses, orbital geometry, and the distorted shapes of two interacting stars. A pulsating variable such as a Cepheid changes brightness because one star expands and contracts.
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