väikseim ja lihtsaim tähesüsteem, koosneb kahest omavahel gravitatsioonijõuga seotud tähest, mis tiirlevad ümber ühise raskuskeskme
star system consisting of two stars orbiting around their common barycenter
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See also: Fraser Cain, 'What is a binary star?', Universe Today, 24 December 2015, http://www.universetoday.com/24203/what-is-a-binary-star/ [9.3.2017]
Binary stars are of interest and importance for several reasons. They provide the only accurate measurements of stellar masses, and the mass of the star turns out to be the primary determinant of its life cycle.
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