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

• 来源期刊: 天文和天体物理学研究
• 年，卷（期）: 2016,（3）
• 页码范围: 107-110
• 页数: 4页
• 语种: 英文
• DOI: 10.1088/1674-4527/16/3/048

摘要

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.