论文标题
来自Gaia DR2的三个新的晚期超速级别的明星候选人具有精致的选择标准
Three New Late-type Hypervelocity Star Candidates from Gaia DR2 with Refined Selection Criteria
论文作者
论文摘要
根据GAIA的第二个数据释放（GAIA DR2），已经报道了几十个候选候选者（HVS）候选者。但是，已经证明，某些GAIA HVS候选者的径向速度并不可靠。在本文中，我们采用精致的天文标准来重新检查GAIA DR2，比以前的作者获得了更可靠的HVS样本和高速速度的候选者。我们开发了一种称为二进制逃生概率分析的方法来识别某些HVS候选者。这种方法使我们能够与只有两个测得的径向速度时期的恒星一起工作。这些恒星通常在以前的类似研究中被丢弃。对我们的最终结果的审查阐明了我们的研究中存在的选择效果，我们建议这是未来研究的重点。我们总共发现三个晚期型（2 G型和1 k型）HVS和21个高速速度候选者，其中3个和11个是新的。从我们计算的历史轨迹来看，这三个HVS候选人都无法拥有银河系中心的起源。需要进一步监控以确认其状态。
Several dozen hypervelocity star (HVS) candidates have been reported based on the second data release of Gaia (Gaia DR2). However, it has been proven that the radial velocities of some Gaia HVS candidates are not reliable. In this paper, we employ refined astrometric criteria to re-examine Gaia DR2, arriving at a more reliable sample of HVS and high velocity star candidates than those found by previous authors.We develop a method called Binary Escape Probability Analysis to identify some HVS candidates. This method allows us to work with stars having only two epochs of measured radial velocity. These stars were usually discarded in previous similar studies. A scrutiny of our final results sheds light on selection effects present in our studies, which we propose to be the focus of future studies. In total, we find three late-type (2 G-type and 1 K-type) HVS and 21 high velocity star candidates, 3 and 11 of which are new, respectively. Judging by their historical trajectories, which we calculate, all three HVS candidates could not have had Galactic center origins. Further monitoring is required to confirm their status.
