论文标题
用Lamost和Galah径向速度验证的Gaia光谱轨道
Gaia Spectroscopic Orbits Validated with LAMOST and GALAH Radial Velocities
论文作者
论文摘要
最近发表的181327光谱二进制（SB）的Gaia DR3目录包括每个轨道的开普勒元素，但不包括测得的径向速度（RVS）及其时期。相反，目录列出了一些表征每个解决方案鲁棒性的参数。在这项工作中，我们使用两个外部来源来验证轨道-17563 Lamost DR6和6018 GALAH DR3恒星，带有具有GAIA -SB轨道的RVS。我们根据Gaia Orbits将预期的RV与Lamost和GalAh测量值进行比较。找到一些与这些测量结果不一致的轨道，我们构建了一个函数，该函数使用已发布的强大参数估算每个Gaia轨道的概率是正确的。我们设计了一个干净但仍然很大的Gaia SB1 91740轨道样本。样品与母体样本不同，因为没有物理上不太可能，因此可能是虚假的 - 偏心率高的短期二进制文件。在仔细建模其余选择效果后，干净的SB1样本提供了对二元人群进行彻底统计研究的前景。首先，从干净的样品中出现了两个可能的特征 - 缺乏低质量原教的短周期二进制文件，这可能是由于某些观察偏置的结果，以及在圆形轨道上的主要序列二进制二进制的子样本，可能是循环过程的证据。
The recently published Gaia DR3 catalog of 181327 spectroscopic binaries (SB) includes the Keplerian elements of each orbit but not the measured radial velocities (RVs) and their epochs. Instead, the catalog lists a few parameters that characterize the robustness of each solution. In this work, we use two external sources to validate the orbits - 17563 LAMOST DR6 and 6018 GALAH DR3 stars with measured RVs that have Gaia-SB orbits. We compare the expected RVs, based on the Gaia orbits, with the LAMOST and GALAH measurements. Finding some orbits that are inconsistent with these measurements, we constructed a function that estimates the probability of each of the Gaia orbits to be correct, using the published robust parameters. We devise a clean but still very large Gaia SB1 sample of 91740 orbits. The sample differs from the parent sample by the absence of - physically unlikely and hence presumably spurious - short-period binaries with high eccentricity. The clean SB1 sample offers the prospect of thorough statistical studies of the binary population after carefully modeling of the remaining selection effects. At a first look, two possible features emerge from the clean sample - a paucity of short-period binaries with low-mass primaries, which might be a result of some observational bias, and a sub-sample of main-sequence binaries on circular orbits, probable evidence for circularization processes.
