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arXiv 1306.6625astro-ph.SRastro-ph.IM
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考虑谱线塞曼展宽的MOOG谱合成代码的修改

Modification of the MOOG spectral synthesis codes to account for Zeeman broadening of spectral lines

Casey Deen

备注：
10 pages, 4 figures Accepted for publication by the Astronomical Journal. Code and tutorial available at http://www.mpia.de/~deen
发表信息：
The Astronomical Journal, 146, 51 (2013)
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摘要：

在试图扩大进入恒星天文学的磁场研究，我提出的MOOGStokes，一个版本的MOOG一维LTE辐射转移代码，大修纳入斯托克斯矢量治疗的偏振辐射通过磁介质。MOOGStokes是一套由三个互补的程序组成的软件，它们可以一起合成具有磁场的恒星的盘平均出射光谱。第一个元素（称为CounterPoint的预处理脚本）针对给定的磁场强度计算塞曼敏感线的分量的波长偏移和偏振。第二个元素（一个MOOG驱动程序，称为SynStokes，来自现有的MOOG驱动程序Synth）使用塞曼移位吸收线的列表以及现有的MOOG机器，在恒星盘的许多位置合成出射光谱，占恒星和磁场几何形状。第三个也是最后一个元素（一个名为DiskoBall的后处理脚本）通过用临边变暗和投影面积对单个出射光谱进行加权，并应用多普勒展宽效应来计算磁盘平均光谱。总而言之，MOOGStokes软件包允许用户在熟悉的计算框架中合成具有磁场的恒星的紧急光谱。MOOGStokes为所有Stokes矢量（I，Q，U和V）生成磁盘平均光谱，并通过连续统进行归一化。MOOGStokes与INVERS10的预测一致，INVERS10是一个在恒星磁场研究中有着悠久历史的极化辐射转移代码。在非磁性极限，MOOGStokes也同意的标量版本的MOOG的预测。

英文摘要：

In an attempt to widen access to the study of magnetic fields in stellar astronomy, I present MOOGStokes, a version of the MOOG one-dimensional LTE radiative transfer code, overhauled to incorporate a Stokes vector treatment of polarized radiation through a magnetic medium. MOOGStokes is a suite of three complementary programs, which together can synthesize the disk-averaged emergent spectrum of a star with a magnetic field. The first element (a pre-processing script called CounterPoint) calculates for a given magnetic field strength, wavelength shifts and polarizations for the components of Zeeman sensitive lines. The second element (a MOOG driver called SynStokes derived from the existing MOOG driver Synth) uses the list of Zeeman shifted absorption lines together with the existing machinery of MOOG to synthesize the emergent spectrum at numerous locations across the stellar disk, accounting for stellar and magnetic field geometry. The third and final element (a post-processing script called DiskoBall) calculates the disk-averaged spectrum by weighting the individual emergent spectra by limb darkening and projected area, and applying the effects of Doppler broadening. All together, the MOOGStokes package allows users to synthesize emergent spectra of stars with magnetic fields in a familiar computational framework. MOOGStokes produces disk-averaged spectra for all Stokes vectors (I, Q, U, and V), normalized by the continuum. MOOGStokes agrees well with the predictions of INVERS10 a polarized radiative transfer code with a long history of use in the study of stellar magnetic fields. In the non-magnetic limit, MOOGStokes also agrees with the predictions of the scalar version of MOOG.

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