宝瓶座π星周盘的多普勒层析成像
Doppler tomography of the circumstellar disk of π Aquarii
摘要：
这项工作的目的是研究明亮的经典双星Be星π Aqr的星周盘。我们分析了π Aqr光谱中Hα发射线双峰轮廓的变化，该光谱在2004- 2013年的约40个轨道周期中的许多阶段中被观察到。我们应用离散傅里叶变换（DFT）方法来搜索峰强度（V/R）比的周期性。多普勒断层扫描用于研究原发灶周围的椎间盘结构。Hα V/R比功率谱中的主频为0.011873天^-1，对应的周期为84.2（2）天，这与之前确定的系统轨道周期Porb=84.1天一致。V/R比随轨道周期呈正弦变化。多普勒谱图显示出主星系盘的非均匀结构：一个内外半径分别为Vin~ 450 km/s和Vin ~ 200 km/s的环，以及一个扩展的稳定区（点），其半径分别为V_x ~ 225 km/s和V_y~100 km/s。假设粒子在圆盘外缘的圆形轨道上作开普勒运动，则圆盘半径约为65 Rsun = 0.33 AU。
英文摘要：
The work is aimed at a study of the circumstellar disk of the bright classical binary Be star π Aqr. We analysed variations of a double-peaked profile of the Hα emission line in the spectrum of π Aqr that was observed in many phases during ~40 orbital cycles in 2004--2013. We applied the Discrete Fourier Transform (DFT) method to search for periodicity in the peak intensity (V/R) ratio. Doppler tomography was used to study the structure of the disk around the primary. The dominant frequency in the power spectrum of the Hα V/R ratio is 0.011873 day^-1 that correspond to a period of 84.2(2) days and is in agreement with the earlier determined orbital period of the system, Porb=84.1 days. The V/R ratio shows a sinusoidal variation phase-locked with the orbital period. Doppler maps of all our spectra show a non-uniform structure of the disk around the primary: a ring with the inner and outer radii at Vin~ 450 km/s and Vout~ 200km/s, respectively, along with an extended stable region (spot) at V_x ~ 225 km/s and V_y~100 km/s. The disk radius of ~ 65 Rsun = 0.33 AU was estimated assuming Keplerian motion of a particle on a circular orbit at the disk outer edge.
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