HD 163296：形成中恒星的喷流

2021年06月22日

HD 163296: Jet from a Star in Formation
Image Credit: Visible: VLT/MUSE (ESO); Radio: ALMA (ESO/NAOJ/NRAO)

Explanation: How are jets created during star formation? No one is sure, although recent images of the young star system HD 163296 are quite illuminating. The central star in the featured image is still forming but seen already surrounded by a rotating disk and an outward moving jet. The disk is shown in radio waves taken by the Atacama Large Millimeter Array (ALMA) in Chile, and show gaps likely created by the gravity of very-young planets. The jet, shown in visible light taken by the Very Large Telescope (VLT, also in Chile), expels fast-moving gas — mostly hydrogen — from the disk center. The system spans hundreds of times the Earth-Sun distance (au). Details of these new observations are being interpreted to bolster conjectures that the jets are generated and shaped, at least in part, by magnetic fields in the rotating disk. Future observations of HD 163296 and other similar star-forming systems may help fill in details.

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HD 163296：形成中恒星的喷流
影像提供: 可见光: VLT/MUSE (ESO); 毫米波: ALMA (ESO/NAOJ/NRAO)

说明: 恒星形成的过程中，到底是如何产生喷流？虽然没人能说个准，不过年轻恒星系统HD 163296的新影像很有启发性。主题影像中心的这颗恒星仍在形成之中，但是周围已有旋绕的拱星盘和外泛的喷流。而建构自智利阿搭卡玛毫米波阵列（ALMA）电波数据的拱星盘，上头的缝隙可能是极稚龄行星的重力所致。使用甚大望远镜（VLT；亦在智利）可见光数据建构出的喷流，则显现从中心射出、主成分为氢的极高速气体。影像中的这个恒星系统，宽度约为地球与太阳距离（au）的数百倍之多。这些新观测所见的细节仍在分析之中，以检验喷流的产生及形状，至少有部分是受到旋转拱星盘的磁场局束之猜想。未来针对HD 163296及其他类似的恒星形成系统的观测，或许可以补充其他的细节。

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