Physical Binary
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
Physical Binary
a binary star whose components are bound by mutual gravitational attraction and orbit a common center of mass. In addition to most visual binaries, physical binaries include spectroscopic binaries, eclipsing binaries, and stars that have dark companions.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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