Visual binary stars exhibit two subpopulations of spin-orbit alignment divided at 31-38 AU, with close systems tightly aligned (Fisher kappa=48) and wide systems less aligned (kappa=6), consistent with distinct formation pathways.
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Stellar separation shapes spin-orbit alignment in visual binaries
Visual binary stars exhibit two subpopulations of spin-orbit alignment divided at 31-38 AU, with close systems tightly aligned (Fisher kappa=48) and wide systems less aligned (kappa=6), consistent with distinct formation pathways.