宝瓶座R星及其不对称H $_{2}$ O壳层的初象
First Images of R Aquarii and its Asymmetric H$_{2}$O Shell
摘要：
我们报告成像观测的象征性的长周期米拉变量宝瓶座R（R Aqr）在近红外和无线电波长。近红外观测是用IOTA成像干涉仪在三个中心为1.51、1.64和1.78 $μ$ m的窄带滤波器中进行的，这些滤波器分别主要对水、连续介质和水的特征进行采样。我们的近红外条纹能见度和关闭相位数据进行了分析，使用三个模型。(a)尺寸与波长相关的均匀圆盘模型无法拟合可见性数据，并且与闭合相数据不一致。(b)一个三分量模型，包括一个Mira星，水壳，和一个离轴点源，提供了一个很好的适合所有的数据。(c)由约束图像重建分析生成的模型提供了更多的洞察力，表明水壳是高度不均匀的，即，cluby。VLBA观测的SiO脉泽外分子信封显示的湍流的证据，与射流的功能包含速度梯度。
英文摘要：
We report imaging observations of the symbotic long-period Mira variable R Aquarii (R Aqr) at near-infrared and radio wavelengths. The near-infrared observations were made with the IOTA imaging interferometer in three narrow-band filters centered at 1.51, 1.64, and 1.78 $μ$m, which sample mainly water, continuum, and water features, respectively. Our near-infrared fringe visibility and closure phase data are analyzed using three models. (a) A uniform disk model with wavelength-dependent sizes fails to fit the visibility data, and is inconsistent with the closure phase data. (b) A three- component model, comprising a Mira star, water shell, and an off-axis point source, provide a good fit to all data. (c) A model generated by a constrained image reconstruction analysis provides more insight, suggesting that the water shell is highly non-uniform, i.e., clumpy. The VLBA observations of SiO masers in the outer molecular envelope show evidence of turbulence, with jet-like features containing velocity gradients.
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