论文标题
来自双线光谱二进制的关节光谱和星体数据的轨道元素和单个成分质量
Orbital elements and individual component masses from joint spectroscopic and astrometric data of double-line spectroscopic binaries
论文作者
论文摘要
我们呈现轨道元素,轨道性视差和单个成分质量,用于14个空间分辨的双线光谱二进制文件,这些光谱二进制于同时拟合其视觉轨道和径向速度曲线。这是通过我们的组开发的马尔可夫链蒙特卡洛代码完成的,该代码产生了所有参数的后验分布函数和错误估计。在该样本中,六个系统具有高质量的先前研究,并作为基准测试了我们的程序,但是即使在这些情况下,我们也可以通过添加对HRCAM和Zorro Speckle Speckle相机在SOAR 4.1M和Gemini Southi South 8.1m telescopes中分别进行HRCAM和Zorro Speckle摄像机的最新数据来改善以前的轨道。我们还为八个没有发表的组合轨道解决方案的对象提供了结果,其中一个也没有视觉轨道。我们可以以典型的不确定性小于1%的典型不确定性确定质量比,不确定性约为1%的质量总和,在最佳情况下,正式不确定性为0.01 m_ \ odot $。我们的轨道性视差与河马和Gaia EDR3的可用三角视差的比较显示出良好的对应关系。差异的平均值与两个目录误差内的零一致。我们还为我们的二进制样本提供了观察性HR图,这些二进制样品与来自不同来源的等铁相结合,使我们能够评估其进化状态以及其光度法的质量。
We present orbital elements, orbital parallaxes and individual component masses, for fourteen spatially resolved double-line spectroscopic binaries derived doing a simultaneous fit of their visual orbit and radial velocity curve. This was done by means of a Markov Chain Monte Carlo code developed by our group, which produces posterior distribution functions and error estimates for all the parameters. Of this sample, six systems had high quality previous studies and were included as benchmarks to test our procedures, but even in these cases we could improve the previous orbits by adding recent data from our survey of southern binaries being carried out with the HRCam and ZORRO speckle cameras at the SOAR 4.1m and Gemini South 8.1m telescopes, respectively. We also give results for eight objects that did not have a published combined orbital solution, one of which did not have a visual orbit either. We could determine mass ratios with a typical uncertainty of less than 1%, mass sums with uncertainties of about 1% and individual component masses with a formal uncertainty of $0.01 M_\odot$ in the best cases. A comparison of our orbital parallaxes with available trigonometric parallaxes from Hipparcos and Gaia eDR3, shows a good correspondence; the mean value of the differences being consistent with zero within the errors of both catalogs. We also present observational HR diagrams for our sample of binaries, which in combination with isochrones from different sources allowed us to asses their evolutionary status and also the quality of their photometry.