论文标题
附近的Quintuple Systems Kappa Tucanae和XI Scorpii
Nearby quintuple systems Kappa Tucanae and Xi Scorpii
论文作者
论文摘要
研究了附近两个宽的分层系统的架构和参数，其中包含五个太阳能星星，$κ$ TUC和$ξ$ SCO。使用GAIA天文学和光度法，质量是由视觉轨道和等线，从光谱或颜色的有效温度确定的。这两个系统都是〜2 Gyr old。它们的空间运动对应于年轻的磁盘，但不匹配任何已知的运动型组。相对于质量和径向速度中心的内部适当运动表明，约8 kau外对是结合的。在内部子系统中未观察到轨道取向之间的相关性。除一个质量外，所有质量都局限于0.8至1.5太阳能的狭窄范围。如果在分层崩溃中所期望的那样，可以解释强烈相关的质量和宽轨道，如果相对隔离形成的那些系统相对隔离形成的那些系统及其成分从共同来源积聚的系统。可以在类似的环境中形成年轻的移动组，其中许多包含高阶层次结构。
Architecture and parameters of two wide nearby hierarchical systems containing five solar-type stars each, $κ$ Tuc and $ξ$ Sco, are studied. Using Gaia astrometry and photometry, masses are determined from visual orbits and isochrones, effective temperatures from spectra or colors. Both systems are ~2 Gyr old. Their spatial motion corresponds to young disk but does not match any known kinematic group. Internal proper motions relative to the center of mass and radial velocities show that wide ~8 kau outer pairs are bound. No correlation between orbit orientations in the inner subsystems is observed. All masses except one are confined to the narrow range from 0.8 to 1.5 solar. Strongly correlated masses and wide orbits can be explained if those systems formed by fragmentation in relative isolation and their components accreted gas from common source, as expected in a hierarchical collapse. Young moving groups could be formed in similar environments, and many of them contain high-order hierarchies.
