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首页> 外文期刊>The Astrophysical journal >SPIRAL STRUCTURE IN THE CIRCUMSTELLAR DISK AROUND AB AURIGAE
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SPIRAL STRUCTURE IN THE CIRCUMSTELLAR DISK AROUND AB AURIGAE

机译：AB AURIGAE周围的圆盘中的螺旋结构

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摘要

We present a near-infrared image of the Herbig Ae star AB Aur obtained with the Coronagraphic Imager with Adaptive Optics mounted on the Subaru Telescope. The image shows a circumstellar emission extending out to a radius of r = 580 AU, with a double spiral structure detected at r = 200-450 AU. The surface brightness decreases as r~(-3.0+-0.1) steeper than the radial profile of the optical emission possibly affected by the scattered light from the envelope surrounding AB Aur. This result, together with the size of the infrared emission similar to that of the ~(13)CO (J = 1-0) disk, suggests that the spiral structure is indeed associated with the circumstellar disk but is not part of the extended envelope. We identified four major spiral arms, which are trailing if the brighter southeastern part of the disk is the near side. The weak gravitational instability, maintained for millions of years by continuous mass supply from the envelope, might explain the presence of the spiral structure at the relatively late phase of the pre-main-sequence period.
机译：我们展示了用安装在斯巴鲁望远镜上的带有自适应光学系统的日冕成像仪获得的Herbig Ae星AB Aur的近红外图像。该图像显示了一个扩展到r = 580 AU半径的星际发射，并在r = 200-450 AU处检测到双螺旋结构。表面亮度比可能受来自AB Aur周围的包络的散射光影响的光发射的径向分布曲线的r〜（-3.0 + -0.1）陡峭地降低。该结果以及与〜（13）CO（J = 1-0）盘相似的红外发射大小表明，螺旋结构确实与星际盘有关，但不是扩展包膜的一部分。我们确定了四个主要的螺旋臂，如果磁盘的东南部较亮，则它们在后面。通过持续不断地从包膜中大量供应而维持了数百万年的弱重力失稳，这可能解释了在主序前期相对较晚阶段螺旋结构的存在。

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