论文标题
由主序列恒星对棕色矮人积聚的3D流体动力学模拟及其对表面丰度的影响
3D Hydrodynamical Simulations of a Brown Dwarf Accretion by a Main-Sequence Star and its Impact on the Surface Li Abundance
论文作者
论文摘要
在主要序列（MS）和（或）RGB中脱颖而出的（增强的）恒星构成了令人困惑的谜团。目前，仍然没有明确的答案，可以使这种耗尽的机制（增强）。一种可能的解释来自，仍然有争议的，观察的证据表明，在某些RGB恒星中，MS恒星托管行星中Li不足的含量不足以及LI丰度和旋转速度之间存在正相关，这表明与行星样物体的一个巨大碰撞是可能的解决方案。在这项研究中，我们探讨了这种情况，在不同初始条件下与MS Star的0.019 mo Brown Dwarf碰撞进行了首次进行3D-HYDRODINARICAL模拟。这使我们能够收集有关托管星中物理结构和最终LI内容的影响的信息。
Li-depleted (enhanced) stars in the main-sequence (MS) and (or) the RGB, pose a puzzling mystery. Presently, there is still no clear answer to the mechanism(s) that enables such Li depletion (enhancement). One possible explanation comes from the, still controversial, observational evidence of Li underabundances in MS stars hosting planets, and of a positive correlation between the Li abundance and rotational velocity in some RGB stars, which suggests a stellar collision with a planet-like object as a possible solution. In this study we explore this scenario, performing for first time 3D-hydrodynamical simulations of a 0.019 Mo brown dwarf collision with a MS star under different initial conditions. This enables us to gather information about the impact on the physical structure and final Li content in the hosting star.
