论文标题
镜子原理和红色巨大颠簸：低质星的熵之战
Mirror principle and the red-giant bump: the battle of entropy in low-mass stars
论文作者
论文摘要
低质量恒星进入红色巨人的演变仍然很少了解。在此演变期间，恒星合同的核心，同时，信封扩展了 - 一个称为“镜像”的过程。此外，在短期中，增加发光度的趋势被逆转。这被称为红色巨型分支颠簸。我们通过考虑恒星中的特定熵分布及其时间变化来探讨这两种现象的根本物理原因。我们发现，在最小的亮度和亮度最小值之间，没有镜子存在，并且恒星完全收缩。当燃气壳达到平均分子量不连续性时，收缩被停止，恒星重新获得镜子。这标志着颠簸的最小发光度。
The evolution of low-mass stars into red giants is still poorly understood. During this evolution the core of the star contracts and, simultaneously, the envelope expands -- a process known as the `mirror'. Additionally, there is a short phase where the trend for increasing luminosity is reversed. This is known as the red-giant-branch bump. We explore the underlying physical reasons for these two phenomena by considering the specific entropy distribution in the star and its temporal changes. We find that between the luminosity maximum and luminosity minimum of the bump there is no mirror present and the star is fully contracting. The contraction is halted and the star regains its mirror when the hydrogen-burning shell reaches the mean molecular weight discontinuity. This marks the luminosity minimum of the bump.
