论文标题
来自热星风的3-D点模型的离散吸收成分
Discrete Absorption Components from 3-D spot models of hot star winds
论文作者
论文摘要
热，大恒星的风与大小空间尺度上发生的过程发生了可变。这种风变性的一种特殊情况是“离散吸收成分”（DAC），它们表现为紫外线共振线光谱中的向外移动密度特征。据信，这种DAC是由恒星风中的大规模螺旋形密度结构引起的。我们考虑了旋转热星风的新型3-D辐射流动力学模型，并研究了由于恒星表面上的局部（伪）磁点而引起的共旋转螺旋结构的出现。随后，使用流体动力模型来检索由3-D短特征辐射传输代码产生的合成紫外光谱中的DAC光谱特征。
The winds of hot, massive stars are variable from processes happening on both large and small spatial scales. A particular case of such wind variability is 'discrete-absorption components' (DACs) that manifest themselves as outward moving density features in UV resonance line spectra. Such DACs are believed to be caused by large-scale spiral-shaped density structures in the stellar wind. We consider novel 3-D radiation-hydrodynamic models of rotating hot star winds and study the emergence of co-rotating spiral structures due to a local (pseudo-)magnetic spot on the stellar surface. Subsequently, the hydrodynamic models are used to retrieve DAC spectral signatures in synthetic UV spectra created from a 3-D short characteristics radiative transfer code.
