论文标题
盖亚EDR3中具有已知轨道的视觉二进制恒星
Visual binary stars with known orbits in Gaia EDR3
论文作者
论文摘要
研究了3350个来自视觉二进制恒星轨道（ORB6）轨道目录的物体，以验证Gaia EDR3视差并为系统提供质量估计。我们表明，在EDR3中没有视差溶液，具有0.2-0.5 ARCSEC分离的2/3二进制物。特别关注521对，与两个组件分别闻名的视差。我们发现16个条目被认为是无关恒星的偶然对准。我们立刻展示了高信二进制系统的示例，其组件的视差差异有显着差异。接下来，我们得出的结论是，据报道的Gaia EDR3视差错误被低估了，至少对于大ruwe的来源而言，它的次数为3倍。需要视差来估计恒星质量。由于在EDR3中，近30 \％的ORB6条目缺乏5或6参数解决方案，因此我们尝试丰富了星体数据。 EDR3中的ORB6条目的遥远伴侣通过分析恒星适当的运动和河马视差。值得注意的是，在28个情况下，二进制组件的固有EDR3视差似乎不如外部伴侣的视差可靠。当EDR3数据不可用时，使用GAIA DR2，TGA和HIPPARCOS视差。获得了主要序列星的G带中的合成质量 - 亮度关系，以提供质量估计值以及通过Kepler的第三定律计算得出的动力学质量。
3350 objects from the Sixth catalog of orbits of visual binary stars (ORB6) are investigated to validate Gaia EDR3 parallaxes and provide mass estimates for the systems. We show that 2/3 of binaries with 0.2 - 0.5 arcsec separation are left without a parallax solution in EDR3. A special attention is paid to 521 pairs with parallax known separately for both components. We find 16 entries that are deemed to be chance alignments of unrelated stars. At once we show examples of high-confidence binary systems with significant differences in the reported parallaxes of their components. Next we conclude that the reported Gaia EDR3 parallax errors are underestimated, at least by a factor of 3 for sources with large RUWE. Parallaxes are needed to estimate stellar masses. Since nearly 30\% of ORB6 entries lack 5 or 6-parameter solution in EDR3, we attempt to enrich the astrometric data. Distant companions of ORB6 entries are revealed in EDR3 by analysis of stellar proper motions and Hipparcos parallaxes. Notably, in 28 cases intrinsic EDR3 parallaxes of the binary components appear to be less reliable than the parallax of the outer companions. Gaia DR2, TGAS and Hipparcos parallaxes are used when EDR3 data is unavailable. Synthetic mass-luminosity relation in the G band for main sequence stars is obtained to provide mass estimates along with dynamical masses calculated via Kepler's Third Law.
