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What is companion star?

Updated: 8/10/2023
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9y ago

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Stars often come in groups of two or more. In the case of a binary star (two stars), the two stars move around their common center of mass - one complete orbit every few hours, days, years, or even thousands of years - just like the planets orbit the Sun. Each of these stars would be the "companion" of the other one. One of these stars can become a black hole; in that case, the gravitational situation doesn't really change - the two (the black hole and the star, in this case) will continue orbiting their common center of mass.

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The term companion star is a name given by astronomers to the less massive in a binary pair; the more massive being called the primary.

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