使用三维非均匀模型的AM Her系统的Stokes成像- I.代码说明和对V834 Cen的应用
Stokes imaging of AM Her systems using 3D inhomogeneous models - I. Description of the code and an application to V834 Cen
摘要：
由于白矮星的强磁场，极星（或AM Her系统）是没有圆盘的激变变星。它们的大部分发射来自吸积柱撞击白矮星并通过回旋加速器和韧致辐射过程冷却的区域。我们提出了一个新的代码，CYCLOPS，模拟从这些系统的光发射，包括四个斯托克斯参数。它考虑了一个三维区域的电子密度和温度变化的\textit{shock-like}的档案和偶极磁场。考虑非零输入辐射的解，分步求解辐射转移。白矮星表面中的柱的足迹由赤道平面中的螺纹区域确定，即，流动沿着磁力线流动的区域。可选地包括由发射区域上方的汤姆逊散射引起的消光。观测数据的拟合使用混合方法完成：遗传算法用于寻找具有最佳模型的区域，然后变形虫代码细化搜索。给出了V834 Cen多波长数据处理的应用实例。拟合发现是与以前的参数估计是一致的，并能够再现V834数据在三个波段的功能。
英文摘要：
Polars (or AM Her systems) are cataclysmic variables without a disc due to the strong magnetic field of the white dwarf. Most of their emission comes from the region where the accretion column impacts the white dwarf and cools through cyclotron and bremsstrahlung processes. We present a new code, CYCLOPS, to model the optical emission from these systems including the four Stokes parameters. It considers a three-dimensional region with the electronic density and temperature varying following a \textit{shock-like} profile and a dipolar magnetic field. The radiative transfer is solved in steps considering the solution with non-null input radiation. The footprint of the column in the white-dwarf surface is determined by the threading region in the equatorial plane, i.e., the region from where the flow follows the magnetic lines. The extinction caused by Thomson scattering above the emitting region is optionally included. The fittings of observational data are done using a hybrid approach: a genetic algorithm is used to seek for the regions having the best models and then an amoeba code refines the search. An example of application to multi-wavelength data of V834 Cen is presented. The fit found is consistent with previous parameters estimates and is able to reproduce the features of V834 data in three wavebands.
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