化学特殊双线双星$χ$~Lupi的质量和年龄
Masses and age of the Chemically Peculiar double-lined binary $χ$~Lupi
摘要：
本文对周期为15.25天的B9.5Vp HgMn + A2Vm双线分光双星HD 141556的两个化学特殊组分的恒星参数进行了测量。我们结合历史的径向速度测量与新的空间分辨天体测量观测PIONIER/VLTI重建的三维轨道的二进制，从而获得个人的质量。我们将可用的测光点与干涉测量提供的通量比拟合在一起，以约束个体大小，并将其与进化模型的预测进行比较。组件的个体质量为$\Ma = 2.84 \pm 0.12\ \Msun$和$\Mb = 1.94 \pm 0.09\ \Msun$。动力学距离与依巴谷视差相容。我们发现线性恒星半径的$\Ra=2.85 \pm 0.15\ \Rsun$和$\Rb=1.75 \pm 0.18\ \Rsun$。这一结果验证了先前详细丰度研究中使用的通量比的后验。我们确定了亚太阳初始金属丰度$Z=0.012\pm0.003$和年龄为$(2.8\pm0.3)\times10^8\ $年。我们的研究结果意味着，主要的旋转速度比它的同步速度慢，而次级可能是同步的。我们表明，强潮汐耦合在前主序列的演变，然后在零年龄的主序列完全解耦提供了一个合理的解释，这些非常低的旋转速率。
英文摘要：
We aim at measuring the stellar parameters of the two Chemically Peculiar components of the B9.5Vp HgMn + A2 Vm double-lined spectroscopic binary HD141556, whose period is 15.25 days. We combined historical radial velocity measurements with new spatially resolved astrometric observations from PIONIER/VLTI to reconstruct the three-dimensional orbit of the binary, and thus obtained the individual masses. We fit the available photometric points together with the flux ratios provided by interferometry to constrain the individual sizes, which we compared to predictions from evolutionary models.The individual masses of the components are $\Ma = 2.84 \pm 0.12\ \Msun$ and $\Mb = 1.94 \pm 0.09\ \Msun$. The dynamical distance is compatible with the Hipparcos parallax. We find linear stellar radii of $\Ra=2.85 \pm 0.15\ \Rsun$ and $\Rb=1.75 \pm 0.18\ \Rsun$. This result validates a posteriori the flux ratio used in previous detailed abundance studies. We determine a sub-solar initial metallicity $Z=0.012\pm0.003$ and an age of $(2.8\pm0.3)\times10^8\ $years. Our results imply that the primary rotates more slowly than its synchronous velocity, while the secondary is probably synchronous. We show that strong tidal coupling during the pre-main sequence evolution followed by a full decoupling at zero-age main sequence provides a plausible explanation for these very low rotation rates.
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