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ESTIMATING Be STAR DISK RADII USING Hα EMISSION EQUIVALENT WIDTHS

机译:使用Hα等效发射宽度估算星盘半径

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摘要

We present numerical models of the circumstellar disks of Be stars, and we. describe the resulting synthetic Hα emission lines and maps of the wavelength-integrated emission flux projected onto the sky. We demonstrate that there are monotonic relationships between the emission-line equivalent width and the ratio of the angular half-width at half-maximum of the projected disk major axis to the radius of the star. These relationships depend mainly on the temperatures of the disk and star, the inclination of the disk normal to the line of sight, and the adopted outer boundary for the disk radius. We show that the predicted Hα disk radii are consistent with those observed directly through long baseline interferometry of nearby Be stars (especially once allowance is made for disk truncation in binaries and for dilution of the observed Hα equivalent width by continuum disk flux in the V band).
机译:我们提出了Be恒星的星盘的数值模型,并且我们。描述合成的Hα发射谱线和投影到天空的波长积分发射通量图。我们证明了在发射线等效宽度和投影圆盘主轴的一半最大处的角半角宽度与恒星半径之间的比率之间存在单调关系。这些关系主要取决于圆盘和恒星的温度,圆盘垂直于视线的倾斜度以及圆盘半径所采用的外边界。我们表明预测的Hα圆盘半径与直接通过附近Be星的长基线干涉法直接观察到的半径一致(尤其是一旦对双星中的磁盘截断和通过V波段中连续的磁盘通量稀释了观测到的Hα当量宽度进行了补偿)。

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