Vol 16, No 3

State transitions triggered by inverse magnetic field: probably applied in high-mass X-ray binaries?

Shuang-Liang Li, Zhen Yan


Abstract Previous works suggested that the state transitions in an X-ray binary can be triggered by accreting an inverse magnetic field from its companion star. A key point of this mechanism is the accretion and magnification of large-scale magnetic fields from the outer boundary of a thin disk. However, how such a process can be realized is still an open question. In this work, we check this issue in a realistic X-ray binary system. According to our calculations, a quite strong initial magnetic field, B ~ 102 − 103 G, is required in order to assure that the large-scale magnetic field can be effectively dragged inward and magnified with the accretion of gas. Thus, such a picture probably can be present in high-mass X-ray binaries possessing a strong stellar magnetic field, e.g., Cyg X-1.


Keywords accretion, accretion disks — black hole physics — (magnetohydrodynamics) MHD — X-rays: binaries

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