论文标题
Thermohaline是否会混合完整的故事？红色巨型分支颠簸附近的单独混合事件的证据
Is Thermohaline Mixing the Full Story? Evidence for Separate Mixing Events near the Red Giant Branch Bump
论文作者
论文摘要
众所周知，包括锂，[C/N]和12C/13C在内的混合敏感元素的丰度会在红色巨型分支凸起附近发生变化。这些改变最常提供的解释是恒星内部的双扩散热盐混合。在此分析中，我们研究了热盐混合解释这些化学耗竭事件的时机的能力。锂和[C/N]的最新观察测量表明，锂的丰度在丰度之前降低了[C/N]，而使用MESA计算的热盐混合区传播的数值模拟表明，合成丰度同时下降。因此，我们得出的结论是，单独的热盐混合无法解释锂耗竭和[C/N]耗竭的不同事件，因为模拟预测的同时性与观察到单独的滴剂的观察不一致。因此，我们邀请了观察到的这些化学耗竭事件的时间分离以及在一系列质量和金属性的更广泛的观察探索中，邀请了更复杂的理论解释。
The abundances of mixing--sensitive elements including lithium, [C/N], and 12C/13C are known to change near the red giant branch bump. The explanation most often offered for these alterations is double diffusive thermohaline mixing in the stellar interior. In this analysis, we investigate the ability of thermohaline mixing to explain the observed timing of these chemical depletion events. Recent observational measurements of lithium and [C/N] show that the abundance of lithium decreases before the abundance of [C/N], whereas numerical simulations of the propagation of the thermohaline mixing region computed with MESA show that the synthetic abundances drop simultaneously. We therefore conclude that thermohaline mixing alone cannot explain the distinct events of lithium depletion and [C/N] depletion, as the simultaneity predicted by simulations is not consistent with the observation of separate drops. We thus invite more sophisticated theoretical explanations for the observed temporal separation of these chemical depletion episodes as well as more extensive observational explorations across a range of masses and metallicities.
