论文标题
在河马和Gaia中解决的宽二进制文件的两范围轨道估计
Two-epoch orbit estimation for wide binaries resolved in Hipparcos and Gaia
论文作者
论文摘要
Hipparcos目录及其双重和多系统附件（DMSA）列出了4099个组件，并在1991.25时期具有单独的适当动作和坐标。这些长期二进制恒星中的许多也存在于Gaia数据释放2（DR2）中。使用可用的相对位置和适当的动作分别为25。25年，可以在两个时期的偏心异常，轨道时期和偏心率的两个时期的相对轨道运动方程式。该方法采用了淘汰线性硫素innes的未知数和其余条件方程的非线性优化。这些解决方案的质量受到河马星形数据的状况不足和适度精度的损害，如蒙特 - 卡洛模拟具有人为扰动的数据点所揭示的那样。多个系统和光学对的存在也会扰动结果。对人工数据的有限实验表明，可以通过25年的时代差异获得有用的估计值，该差异为25年，轨道周期为500美元。该方法的前景通过提出的下一代天文标准任务（例如Gaia-nir和Theia）大大改善，尤其是在包括Astrestric或Spectroscopic测量中包括其他条件时。在Gaia DR2和Hipparcos中交叉匹配的1295双星对的交叉识别和天文信息的辅助目录发布。
The Hipparcos catalog and its Double and Multiple System Annex (DMSA) lists 4099 components with individual proper motions and coordinates on the epoch 1991.25. Many of these long-period binary stars are also present in the Gaia Data Release 2 (DR2). Using the available relative positions and proper motions separated by 25.25 years, the equations of relative orbital motion can be solved for the two epoch eccentric anomalies, orbital period, and eccentricity. The method employs elimination of the linear Thiele-Innes unknowns and nonlinear optimization of the remaining condition equations. The quality of these solutions is compromised by the insufficient condition and modest precision of the Hipparcos astrometric data, as revealed by Monte-Carlo simulations with artificially perturbed data points. The presence of multiple systems and optical pairs can also perturb the results. Limited experiments with artificial data indicate that useful estimates can be obtained with a 25-year epoch difference for wide binaries with orbital periods up to $\sim 500$ years. The prospects of this method dramatically improve with the proposed next-generation space astrometry missions such as Gaia-NIR and Theia, especially when additional conditions are included from astrometric or spectroscopic measurements. A ancillary catalog of cross-identification and astrometric information for 1295 double star pairs cross-matched in Gaia DR2 and Hipparcos is published.
