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physical object > natural object > celestial body > collection of stars > star system

star system
subject			fact

star system	has abundance half the stars in the solar neighborhood are members of star systems
	has definition A few stars that orbit each other.
	is a kind of collection of stars
collection of stars	has number of stars
	has catalog catalog about star systems
celestial body	has spectra
physical object	has location or center of gravity
	has angular momentum
	has mass
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

Kinds of star system :

• binary star (57 kinds, 339 facts) - A system of two stars orbiting around a common center of gravity. Visual binaries are those whose components can be resolved telescopically (i.e., angular separation > 0'.5) and which have detectable orbital motion. Astrometric binaries are those whose dual nature can be deduced from their variable proper motion; spectroscopic binaries, those whose dual nature can be deduced from their variable radial velocity. At least half of the stars in the solar neighborhood are members of binary (or multiple) systems. (See photometric binaries; optical pairs.)
• triple star (2 kinds, 22 facts) - A star system having three stars that revolve around one another.