V505 Sgr系统中轨道和光时效应的统一解
A unified solution for the orbit and light-time effect in the V505 Sgr system
摘要：
人马座V505的多重系统至少由三颗恒星组成：一颗紧凑的食对和一颗遥远的组成部分，其轨道直接使用斑点干涉测量法测量。为了解释人马座V505中第三个天体的观测轨道以及其他可观测的量，即食双星的最小时刻和光谱中两个不同的径向速度，我们彻底测试了第四体假设-一个昏暗的，尚未观测到的物体的扰动。我们使用一个N体数值积分器来模拟这个系统中3或4个分量的未来和过去轨道演化。我们从所有可用的散斑干涉、最小定时和径向速度数据中构造一个合适的卡方度量，然后扫描参数空间的一部分，以获得至少一些允许的解。原则上，我们能够用第四个物体的存在来解释所有可观测的量，但是这个假设的可能性非常低。我们还讨论了其他的理论解释的最小定时变化。在未来十年内对最小值时间的进一步观察或高分辨率光谱数据可以显着限制模型。
英文摘要：
The multiple system V505 Sagittarii is composed of at least three stars: a compact eclipsing pair and a distant component, which orbit is measured directly using speckle interferometry. In order to explain the observed orbit of the third body in V505 Sagittarii and also other observable quantities, namely the minima timings of the eclipsing binary and two different radial velocities in the spectrum, we thoroughly test a fourth-body hypothesis - a perturbation by a dim, yet-unobserved object. We use an N-body numerical integrator to simulate future and past orbital evolution of 3 or 4 components in this system. We construct a suitable chi^2 metric from all available speckle-interferometry, minima-timings and radial-velocity data and we scan a part of a parameter space to get at least some of allowed solutions. In principle, we are able to explain all observable quantities by a presence of a fourth body, but the resulting likelihood of this hypothesis is very low. We also discuss other theoretical explanations of the minima timings variations. Further observations of the minima timings during the next decade or high-resolution spectroscopic data can significantly constrain the model.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
