Magnetic field effects on the crust structure of neutron stars
Magnetic field effects on the crust structure of neutron stars
复制标题
磁场对中子星地壳结构的影响
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
S. Schramm
中科院分区：
文献类型：
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作者：
B. Franzon;R. Negreiros;S. Schramm
我们研究了强磁场对中子星地壳结构和几何形状的影响。我们发现地壳的几何形状被星星内部的磁场大大改变。我们利用已知的状态方程描述中子星星壳，即Skyrme模型（Sky）描述内壳，Baym，Pethick，and Sutherland（BPS）状态方程描述外壳，建立了稳态和轴对称磁化恒星模型。我们表明，磁场有双重作用，有助于地壳变形通过电磁相互作用（在这种情况下表现为洛伦兹力），并通过有助于曲率由于存储在它的能量。我们还研究了由于磁场的地壳变形的直接后果：热弛豫时间。这个量，这是非常重要的中子星的热演化是敏感的地壳性质，因此，我们表明，它可能会受到强烈的磁场影响。
We study the effects of high magnetic fields on the structure and on the geometry of the crust in neutron stars. We find that the crust geometry is substantially modified by the magnetic field inside the star. We build stationary and axis-symmetric magnetized stellar models by using well-known equations of state to describe the neutron star crust, namely the Skyrme model (Sky) for the inner crust and the Baym, Pethick, and Sutherland (BPS) equation of state for the outer crust. We show that the magnetic field has a dual role, contributing to the crust deformation via the electromagnetic interaction (manifested in this case as the Lorentz force) and by contributing to curvature due to the energy stored in it. We also study a direct consequence of the crust deformation due to the magnetic field: the thermal relaxation time. This quantity, which is of great importance to the thermal evolution of neutron stars is sensitive to the crust properties and, as such, we show that it may be strongly affected by the magnetic field.