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Star system

Artist's impression of the orbits of HD 188753, a triple star system
The Algol system as it appeared on 12 August 2009. Not an artistic representation, but a true two-dimensional image with 1/2 milli-arcsecond resolution in the near-infrared H-band.
Algol (β Persei) is a triple-star system (Algol A, B, and C) in the constellation Perseus. Algol A is eclipsed by the dimmer Algol B every 2.87 days. This animation was assembled from 55 images in the near-infrared H-band. Because some phases are poorly covered, B jumps at some points along its path.

A star system or stellar system is a small number of stars which orbit each other, bound by gravitational attraction.[1]

A large number of stars bound by gravitation is generally called a star cluster but, broadly speaking, they are also star systems. Star systems are not to be confused with planetary systems, which include planets and similar bodies.

A stellar system of two stars is known as a binary star, binary star system or physical double star. If there are no tidal effects, no disturbance from other forces, and no transfer of mass from one star to the other, such a system is stable. Both stars will orbit around the center of mass of the system indefinitely. Examples of binary systems are Sirius, Procyon and Cygnus X-1, the last of which probably consists of a star and a black hole.

  1. ↑ "Star system" in Modern Dictionary of Astronomy and Space Technology. A.S. Bhatia, ed. New Delhi: Deep & Deep Publications, 2005. ISBN 81-7629-741-0

Star system

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