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arXiv 0909.2997astro-ph.HE
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磁化中子星大气模型

Models of magnetized neutron star atmospheres

V. Suleimanov, A. Y. Potekhin, K. Werner

摘要:

我们提出了一个新的计算机程序,用于在宽的磁场(10^{12} - 10^{15} G)和有效温度(3 \times 10^5 - 10^7 K)范围内模拟磁化中子星大气。假设大气层是由完全电离的电子-离子等离子体或部分电离的氢组成。考虑了真空谐振和部分模式转换。磁场相对于恒星表面的任何倾斜都是允许的。我们利用强磁场中完全或部分电离等离子体的现代不透明度,求解等离子体中正常电磁模式的耦合辐射转移方程。利用这个程序,我们研究了用不同的大气模型解释孤立中子星的软X射线谱的可能性。特别是,使用“三明治”模型(薄大气层与氢层以上的氦层)的出射光谱构造。薄的部分电离氢真空极化的气氛被证明是能够提高我们的理解附近的孤立的中子星RBS 1223(RX J1308.8+2127)的观测光谱。

英文摘要:

We present a new computer code for modeling magnetized neutron star atmospheres in a wide range of magnetic fields (10^{12} - 10^{15} G) and effective temperatures (3 \times 10^5 - 10^7 K). The atmosphere is assumed to consist either of fully ionized electron-ion plasmas or of partially ionized hydrogen. Vacuum resonance and partial mode conversion are taken into account. Any inclination of the magnetic field relative to the stellar surface is allowed. We use modern opacities of fully or partially ionized plasmas in strong magnetic fields and solve the coupled radiative transfer equations for the normal electromagnetic modes in the plasma. Using this code, we study the possibilities to explain the soft X-ray spectra of isolated neutron stars by different atmosphere models. In particular, the outgoing spectrum using the "sandwich" model (thin atmosphere with a hydrogen layer above a helium layer) is constructed. Thin partially ionized hydrogen atmospheres with vacuum polarization are shown to be able to improve our understanding of the observed spectrum of the nearby isolated neutron star RBS 1223 (RX J1308.8+2127).

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