Temperature Profiles of Accretion Disks around Rapidly Rotating Neutron Stars in General Relativity and the Implications for Cygnus X-2
Temperature Profiles of Accretion Disks around Rapidly Rotating Neutron Stars in General Relativity and the Implications for Cygnus X-2
复制标题
广义相对论中快速旋转中子星周围吸积盘的温度分布及其对天鹅座 X-2 的影响
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
B. Datta
中科院分区：
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作者：
S. Bhattacharyya;A. V. Thampan;R. Misra;B. Datta
我们计算的温度分布（薄）吸积盘周围快速旋转的中子星（低表面磁场），考虑到广义相对论的全部影响。然后，我们考虑一个模型的光谱的X射线发射的磁盘是参数化的质量吸积率，色温，和旋转速率的中子星星。我们推导出的X射线源天鹅座X-2使用的最高温度在磁盘沿着与磁盘和边界层光度的估计，使用从EXOSAT数据推断的光谱这些参数的约束。我们的计算表明，天鹅座X-2中的中子星星的旋转接近离心质量脱落极限。讨论了中子星星状态方程可能存在的约束条件。
We calculate the temperature profiles of (thin) accretion disks around rapidly rotating neutron stars (with low surface magnetic fields), taking into account the full effects of general relativity. We then consider a model for the spectrum of the X-ray emission from the disk that is parameterized by the mass accretion rate, the color temperature, and the rotation rate of the neutron star. We derive constraints on these parameters for the X-ray source Cygnus X-2 using the estimates of the maximum temperature in the disk along with the disk and boundary layer luminosities, using the spectrum inferred from the EXOSAT data. Our calculations suggest that the neutron star in Cygnus X-2 rotates close to the centrifugal mass-shed limit. Possible constraints on the neutron star equation of state are also discussed.