Modules for Experiments in Stellar Astrophysics (MESA): Pulsating Variable Stars, Rotation, Convective Boundaries, and Energy Conservation
Modules for Experiments in Stellar Astrophysics (MESA): Pulsating Variable Stars, Rotation, Convective Boundaries, and Energy Conservation
复制标题
DOI：
10.3847/1538-4365/ab2241
复制
发表时间：
2019-07-01
影响因子：
8.7
通讯作者：
Timmes, F. X.
中科院分区：
文献类型：
--
作者：
Paxton, Bill;Smolec, R.;Timmes, F. X.
我们更新的开放知识的软件仪器模块恒星天体物理学实验（梅萨）的能力。RS P是MESAstar中的一个新功能，它模拟了代表RR型天琴座、造父变星和其他类型变星的非线性径向恒星脉动。我们显著增强数值能量守恒能力，包括在质量变化期间。例如，这使得通过He闪光的计算能够将能量保存到优于0.001%。为了改进梅萨中旋转恒星的建模，我们引入了一种新的方法来修改恒星结构的压力和温度方程，以及重力暗化的投影效应的公式。一个新的计划，用于跟踪对流边界产生可靠的值的对流核心质量，并允许自然出现的绝热对流区在核心氢和氦燃烧阶段。我们量化了梅萨在当前一代多核架构上的并行性能，并证明了辐射悬浮计算效率的提高。我们报告更新状态方程和核反应物理模块。我们简要地讨论了目前的处理回落在核心坍缩超新星模型和超新星爆炸的热力学演化。最后，我们讨论了新的梅萨Testhub软件基础设施，以增强源代码开发。
We update the capabilities of the open-knowledge software instrument Modules for Experiments in Stellar Astrophysics (MESA). RS P is a new functionality in MESAstar that models the nonlinear radial stellar pulsations that characterize RR Lyrae, Cepheids, and other classes of variable stars. We significantly enhance numerical energy conservation capabilities, including during mass changes. For example, this enables calculations through the He flash that conserve energy to better than 0.001%. To improve the modeling of rotating stars in MESA, we introduce a new approach to modifying the pressure and temperature equations of stellar structure, as well as a formulation of the projection effects of gravity darkening. A new scheme for tracking convective boundaries yields reliable values of the convective core mass and allows the natural emergence of adiabatic semiconvection regions during both core hydrogen- and helium-burning phases. We quantify the parallel performance of MESA on current-generation multicore architectures and demonstrate improvements in the computational efficiency of radiative levitation. We report updates to the equation of state and nuclear reaction physics modules. We briefly discuss the current treatment of fallback in core-collapse supernova models and the thermodynamic evolution of supernova explosions. We close by discussing the new MESA Testhub software infrastructure to enhance source code development.