论文标题
通过新物理学引起的额外能量损失增强锂在红色团恒星中的增强
Enhancement of Lithium in Red Clump Stars by the Additional Energy Loss Induced by New Physics
论文作者
论文摘要
由于7LI在低温下很容易破坏，因此随着恒星的发展，表面锂丰度会减小。在大多数红色巨人的大气中观察到的锂耗竭支持了这一点。但是，最近的研究表明，几乎所有的红色团恒星都具有高锂丰度A（li）> -0.9，这是低质量恒星进化的标准理论所预测的。为了调和观测值和模型之间的差异，我们考虑了可能来自标准模型以外的物理学的其他能量损失通道。 A（Li）即使在标准模型中，由于Cameron-Fowler机制产生了7BE，但在标准模型中，A（Li）也会在红色巨型分支的尖端附近略有增加，但是所得的7li丰度远低于观察到的值。我们发现，如果有其他能量损失通道，则7BE的产生会变得更加活跃，因为Themohaline混合变得更加有效，并且形成了较重的氦气芯。
Since 7Li is easily destroyed in low temperatures, the surface lithium abundance decreases as stars evolve. This is supported by the lithium depletion observed in the atmosphere of most red giants. However, recent studies show that almost all of red clump stars have high lithium abundances A(Li)>-0.9, which are not predicted by the standard theory of the low-mass stellar evolution. In order to reconcile the discrepancy between the observations and the model, we consider additional energy loss channels which may come from physics beyond the Standard Model. A(Li) slightly increases near the tip of the red giant branch even in the standard model with thermohaline mixing because of the 7Be production by the Cameron-Fowler mechanism, but the resultant 7Li abundance is much lower than the observed values. We find that the production of 7Be becomes more active if there are additional energy loss channels, because themohaline mixing becomes more efficient and a heavier helium core is formed.
