The bottom magnetic field and magnetosphere evolution of neutron star in low-mass X-ray binary
The bottom magnetic field and magnetosphere evolution of neutron star in low-mass X-ray binary
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DOI：
10.1111/j.1365-2966.2005.09802.x
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发表时间：
2004-10
影响因子：
4.8
通讯作者：
Chengming Zhang;Y. Kojima
中科院分区：
文献类型：
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作者：
Chengming Zhang;Y. Kojima
研究了吸积中子星星（NS）的磁场演化，认为吸积流将磁场线拖到一边，稀释了极场强度，导致赤道磁场强度增加，并由于吸积引起的星星壳的整体压缩而埋藏在壳内.模型的主要结论是：（i）极场随吸积质量的增加而衰减，（ii）当NS磁层半径接近星星半径时，可产生约10 8 G的底磁场，且底磁场强度与吸积速率的关系为stecM 1/2 ; NS磁层半径随吸积而减小，直至达到星星半径，其演化受初始场和吸积速率的影响很小，吸积速率为0.01 M Ω，这意味着低质量X射线双星中的NS如果吸积了相当的质量，其磁层半径将是均匀的。作为推广，讨论了X射线中子源和再循环中子星中可能存在的强磁区的物理效应。此外，强磁场
The accretion-induced neutron star (NS) magnetic field evolution is studied through considering the accretion flow to drag the field lines aside and dilute the polar-field strength, and as a result the equatorial field strength increases, which is buried inside the crust on account of the accretion-induced global compression of star crust. The main conclusions of model are as follows: (i) the polar field decays with increase in the accreted mass; (ii) the bottom magnetic field strength of about 10 8 G can occur when the NS magnetosphere radius approaches the star radius, and it depends on the accretion rate as ˙ M 1/2 ; and (iii) the NS magnetosphere radius decreases with accretion until it reaches the star radius, and its evolution is little influenced by the initial field and the accretion rate after accreting ∼0.01 M� , which implies that the magnetosphere radii of NSs in low-mass X-ray binaries would be homogeneous if they accreted the comparable masses. As an extension, the physical effects of the possible strong magnetic zone in the X-ray NSs and recycled pulsars are discussed. Moreover, the strong magnetic fields