Wind Accretion and State Transitions in Cygnus X-1 by D. R. Gies and others 2026-10-20
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Astrophysical Journal 583, 424–436. arxiv.org/abs/astro-ph/0206253
The primary spectroscopic monitoring study compares H-alpha wind emission with X-ray state changes. The wind-to-accretion interpretation depends on wind velocity and ionization as well as mass loss; its abstract reports that a stronger H-alpha wind need not yield a brighter soft X-ray state.
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