用光谱测量和NLTE辐射转移模型探测Be星盘的性质：β CMi
Probing the properties of Be star discs with spectroastrometry and NLTE radiative transfer modelling: beta CMi
摘要：
虽然经典Be星周围的圆盘已经被证实存在，但它们的起源仍然不确定。为了理解是什么过程导致了这些圆盘的产生，以及角动量是如何在其中传输的，它们的物理性质必须受到限制。这需要将高空间和光谱分辨率数据与详细的辐射转移模型进行比较。我们提出了一个高光谱分辨率，R~80,000，亚毫角秒精度，光谱天体测量研究的拱盘周围的Be星β CMi。数据面临的三维，NLTE辐射转移计算直接约束光盘的属性。此外，我们比较的数据，光盘模型具有两个速度定律;凯佩里安，预测的粘性盘模型，和角动量守恒旋转。它表明，β CMi的观测只能用开普勒旋转再现。该模型和观察到的SED，偏振和光谱签名的β CMi之间的协议确认，被恒星周围的光盘是很好的建模为粘性decretion光盘。
英文摘要：
While the presence of discs around classical Be stars is well established, their origin is still uncertain. To understand what processes result in the creation of these discs and how angular momentum is transported within them, their physical properties must be constrained. This requires comparing high spatial and spectral resolution data with detailed radiative transfer modelling. We present a high spectral resolution, R~80,000, sub milli-arcsecond precision, spectroastrometric study of the circumstellar disc around the Be star beta CMi. The data are confronted with three-dimensional, NLTE radiative transfer calculations to directly constrain the properties of the disc. Furthermore, we compare the data to disc models featuring two velocity laws; Keperian, the prediction of the viscous disc model, and angular momentum conserving rotation. It is shown that the observations of beta CMi can only be reproduced using Keplerian rotation. The agreement between the model and the observed SED, polarisation and spectroastrometric signature of beta CMi confirms that the discs around Be stars are well modelled as viscous decretion discs.
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