基于XHIP星表数据的太阳运动学观测
Search for Kinematic Siblings of the Sun Based on Data from the XHIP Catalog
摘要：
我们从XHIP星表中选出了1872颗相对视差测量误差<20%、相对太阳空间速度绝对值<15 km/s的F-G-K星。对于所有这些恒星，我们已经构建了他们的银河系轨道4.5 Gyr到过去使用轴对称银河系的潜力模型与津贴的扰动螺旋密度波。与太阳轨道的遭遇参数已计算出每个轨道。在过去的很长一段时间里，我们已经发现了三颗新的恒星，它们的银河系轨道接近太阳系轨道。这三颗恒星分别是HIP 43852、HIP 104047和HIP 112158。光谱双星HIP 112158的年龄和光谱特征不适合作为太阳的运动兄弟。对于单星HIP 43852和多系统HIP 104047来说，这个作用是很可能的。我们还确认了先前发现的近距离接触候选者HIP 47399和HIP 87382的状态。HIP 87382的化学成分非常接近太阳，是目前最有可能的候选者，因为它持续显示出与太阳在超过3 Gyr的时间尺度上的近距离接触，当使用各种银河势模型时，无论是没有还是考虑到螺旋密度波的影响。
英文摘要：
From the XHIP catalogue, we have selected 1872 F-G-K stars with relative parallax measurement errors <20% and absolute values of their space velocities relative to the Sun <15 km/s. For all these stars, we have constructed their Galactic orbits for 4.5 Gyr into the past using an axisymmetric Galactic potential model with allowance made for the perturbations from the spiral density wave. Parameters of the encounter with the solar orbit have been calculated for each orbit. We have detected three new stars whose Galactic orbits were close to the solar one during a long time interval in the past. These stars are HIP 43852, HIP 104047, and HIP 112158. The spectroscopic binary HIP 112158 is poorly suited for the role of a kinematic sibling of the Sun by its age and spectroscopic characteristics. For the single star HIP 43852 and the multiple system HIP 104047, this role is quite possible. We have also confirmed the status of our previously found candidates for close encounters, HIP 47399 and HIP 87382. The star HIP 87382 with a chemical composition very close to the solar one is currently the most likely candidate, because it persistently shows close encounters with the Sun on time scales of more than 3 Gyr when using various Galactic potential models both without and with allowance made for the influence of the spiral density wave.
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