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arXiv 0812.3023astro-ph
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耗散超流中子星的振荡

On the oscillations of dissipative superfluid neutron stars

N. Andersson, K. Glampedakis, B. Haskell

摘要:

我们调查的振荡缓慢旋转的超流星,考虑到涡介导的相互摩擦力,预计是主要的阻尼机制,在成熟的中子星的核心。工作的线性顺序在旋转的恒星,我们认为这两个基本的f-模式和惯性r-模式。在(极)f-模式的情况下,我们工作出一个解析近似的模式,使我们能够写下一个封闭的表达式的相互摩擦阻尼时标。分析结果是在很好的协议与以前的数值计算结果使用能量积分参数。我们扩展了以前的工作,考虑了整个范围的允许值的涡阻力,例如,每个单独的涡流和电子流体之间的摩擦。这导致有史以来第一次的结果,在强阻力制度的f-模式。我们的估计提供了有用的洞察力的依赖性和相关性,各种状态方程参数。在(轴向)r-模式的情况下,我们确认存在两类模式。然而,我们证明,只有一个这些集仍然是纯粹的轴向在更现实的中子星模型。我们的分析奠定了基础的同伴研究的相互摩擦阻尼的r-模式在二阶的慢旋转近似,第一次演化的超流中子星扰动,也是第一次详细的尝试,研究动力学的超流中子星与组件之间的相对旋转和相互摩擦。

英文摘要:

We investigate the oscillations of slowly rotating superfluid stars, taking into account the vortex mediated mutual friction force that is expected to be the main damping mechanism in mature neutron star cores. Working to linear order in the rotation of the star, we consider both the fundamental f-modes and the inertial r-modes. In the case of the (polar) f-modes, we work out an analytic approximation of the mode which allows us to write down a closed expression for the mutual friction damping timescale. The analytic result is in good agreement with previous numerical results obtained using an energy integral argument. We extend previous work by considering the full range of permissible values for the vortex drag, e.g. the friction between each individual vortex and the electron fluid. This leads to the first ever results for the f-mode in the strong drag regime. Our estimates provide useful insight into the dependence on, and relevance of, various equation of state parameters. In the case of the (axial) r-modes, we confirm the existence of two classes of modes. However, we demonstrate that only one of these sets remains purely axial in more realistic neutron star models. Our analysis lays the foundation for companion studies of the mutual friction damping of the r-modes at second order in the slow-rotation approximation, the first time evolutions for superfluid neutron star perturbations and also the first detailed attempt at studying the dynamics of superfluid neutron stars with both a relative rotation between the components and mutual friction.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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