Companion star
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In a binary system, the brighter star is called the primary star and is designated A, and the fainter star is called the companion star and is designated B. In a triple binary system, the faintest star is called the second companion star. Observations of the companion star of Sirius led to the discovery of white dwarfs and the degeneracy of matter. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
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連星のうちで，明るいほうを主星と呼んでAで表わし，暗いほうを伴星と呼びBで表わす。三重連星では最も暗いものを第2伴星という。シリウスの伴星の観測は白色矮星と物質の縮退の発見の端緒となった。
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