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arXiv 1610.09339astro-ph.SR
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Be双星衰变盘上的辐射转移

Radiative transfer on decretion discs of Be binaries

Despina Panoglou, Daniel M. Faes, Alex C. Carciofi, Atsuo T. Okazaki, Thomas Rivinius

摘要:

在这项工作中,我们探讨了在Be星的递减盘的二元性的影响,以解释他们的变化。为了这个目的,我们进行了光滑粒子流体动力学(SPH)模拟Be二进制系统,以下的物质喷射各向同性从赤道的Be星对基地的等温decretion光盘。我们让系统演化足够长的时间被认为是在稳定状态,并专注于共面的粘性双星轨道的效果。发现盘结构被锁定到轨道相位,也表现出依赖于方位角。此外,我们提出了详细的非局部热力学平衡(非LTE)辐射转移计算的光盘结构与SPH代码的第一个结果。这是通过使用三维(3D)蒙特卡罗代码HDUST来实现的,该代码可以对一系列可观测量进行预测。

英文摘要:

In this work we explore the effect of binarity in the decretion disc of Be stars, in order to explain their variability. To this aim, we performed smoothed particle hydrodynamics (SPH) simulations on Be binary systems, following the matter ejected isotropically from the equator of the Be star towards the base of an isothermal decretion disc. We let the system evolve for time long enough to be considered at steady state, and focus on the effect of viscosity for coplanar prograde binary orbits. The disc structure is found to be locked to the orbital phase, exhibiting also a dependence on the azimuthal angle. Additionally, we present the first results from detailed non-local thermodynamic equilibrium (non-LTE) radiative transfer calculations of the disc structure computed with the SPH code. This is achieved by the use of the three-dimensional (3D) Monte Carlo code HDUST, which can produce predictions with respect to a series of observables.

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