AI 中文总结
对原恒星系统VLA1623 - 2417进行天体测量分析，结合多阵列观测数据得出各分量自行。Aa/Ab有轨道运动但难估质量，W与A、B投影距离减小，其运动不符弹出情景，推测W与A/B关系及轨道情况。
AI 中文摘要
我们对四重原恒星系统VLA1623 - 2417进行了详细的天体测量分析，得出了A、B和W分量的精确绝对自行，以及首次得到的A的致密双星分量（Aa和Ab）的单独运动。研究结合了来自阿塔卡马大型毫米波/亚毫米波阵列（ALMA）和卡尔·G·扬斯基甚大阵列（VLA）在厘米和毫米波长的37次存档干涉测量观测，并补充了来自文献中的亚毫米波阵列（SMA）和伯克利 - 伊利诺伊 - 马里兰协会（BIMA）毫米波阵列的额外数据。这些数据为B分量提供了约34.5年的时间基线，为W分量提供了约32.5年的时间基线，为Aa和Ab单独分量提供了约11年的时间基线。Aa/Ab的相对自行表明有显著的轨道运动，但覆盖的轨道部分太小，无法提供可靠的质量估计。W相对于A和B分量的相对自行表明它们的投影距离以1至2千米/秒的速度减小。这些向内的运动与W从VLA1623 - 2417系统中被动态弹出的情景不一致。相反，我们认为W要么不与A/B分量束缚在一起，要么在一个高度倾斜的轨道上运动。
英文摘要
We present a detailed astrometric analysis of the quadruple protostellar system VLA1623-2417, deriving accurate absolute proper motions for components A, B, and W, as well as, for the first time, individual motions for the compact binary components of A (Aa and Ab). Our study combines 37 archival interferometric observations from the Atacama Large Millimeter/submillimeter Array (ALMA) and the Karl G. Jansky Very Large Array (VLA) at centimeter and millimeter wavelengths, supplemented with additional data from the Submillimeter Array (SMA) and the Berkeley-Illinois-Maryland Association (BIMA) millimeter array taken from the literature. Together, these data provides time baselines of ~34.5 years for component B, ~32.5 years for component W, and ~11 years for the individual components Aa and Ab. The relative proper motions of Aa/Ab indicate significant orbital motions, but cover too small a fraction of the orbit to provide a reliable mass estimate. The relative proper motions of W with respect to components A and B indicate that their projected separations are decreasing at a rate of 1 to 2 km/s. These inward motions are inconsistent with scenarios in which component W has been dynamically ejected from the VLA1623-2417 system. Instead, we argue that W is either not bound to the A/B components or is moving on a highly inclined orbit.
CommentsSubmitted to MNRAS
