Abstract

We have studied stellar candidates for close (within 1 pc) encounters with the Solar system. For all of the stars under consideration the kinematic characteristics have been taken from the Gaia EDR3 catalogue. The parameters of the encounters of these stars with the Solar system have been calculated using three methods: (1) the linear one, (2) by integrating the orbits in an axisymmetric potential, and (3) by integrating the orbits in a potential with a spiral density wave. All three methods are shown to yield similar results. We have selected five stars that are good candidates for reaching the boundaries of the Oort cloud and passing through it. Based on the second method, in good agreement with the other two methods, we have obtained the following estimates of the encounter parameters for the star GJ 710: \(t_{\textrm{min}}=1.320\pm 0.028\) Myr and \(d_{\textrm{min}}=0.020\pm 0.007\) pc. It is also interesting to note the star Gaia EDR3 510911618569239040 with parameters \(t_{\textrm{min}}={-}2.863\pm 0.046\) Myr and \(d_{\textrm{min}}=0.057\pm 0.079\) pc.

中文翻译：

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基于盖亚 EDR3 目录中的数据研究恒星与太阳系的近距离接触

摘要

我们研究了与太阳系近距离接触（在 1 pc 内）的候选恒星。对于所有考虑中的恒星，其运动学特征均来自盖亚 EDR3 目录。这些恒星与太阳系相遇的参数已使用三种方法计算：（1）线性方法，（2）通过在轴对称势中对轨道进行积分，以及（3）通过在势能中对轨道进行积分螺旋密度波。显示所有三种方法产生相似的结果。我们选择了五颗非常适合到达奥尔特云边界并穿过它的恒星。基于第二种方法，与其他两种方法非常吻合，我们得到了 GJ 710 恒星遭遇参数的以下估计：\(t_{\textrm{min}}=1.320\pm 0.028\) Myr 和\(d_{\textrm{min}}=0.020\pm 0.007\) pc。值得注意的是，恒星 Gaia EDR3 510911618569239040 的参数为\(t_{\textrm{min}}={-}2.863\pm 0.046\) Myr 和\(d_{\textrm{min}}=0.057\pm 0.079 \)电脑。