标题： 高温恒星风三维斑点模型中的离散吸收组分 显示英文标题

标题： Discrete Absorption Components from 3-D spot models of hot star winds

摘要： 大质量恒星的风会因发生在大尺度和小尺度上的过程而发生变化。 此类风变化的一个特例是“离散吸收成分”（DACs），它们在紫外共振线光谱中表现为向外移动的密度特征。 人们认为这些DACs是由恒星风中的大规模螺旋状密度结构引起的。 我们研究了旋转大质量恒星风的新三维辐射流体力学模型，并探讨了由于恒星表面局部伪磁场斑点导致的共转螺旋结构的出现。 随后，利用流体力学模型从三维短特征辐射传输代码生成的合成紫外光谱中检索DAC光谱特征。 显示英文摘要

摘要： 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.