发表机构
Durham University（杜伦大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究探讨轴子对天琴座RR型星周期-光度关系的影响，发现轴子冷却效应使核心质量增加，导致PLR零点向更亮方向偏移，且该偏移与M3星团零点校准不确定性相当。
AI 中文摘要
我们研究了轴子对天琴座RR型星周期-光度关系（PLR）的影响。在红巨星分支阶段，通过电子耦合的发射使核心冷却，增加了其点火时的质量。更大的核心产生更亮的水平分支恒星，系统性地将天琴座RR型星PLR的零点向更亮的星等方向移动。我们利用针对其年龄和成分定制的恒星演化和脉动计算，对球状星团M3的天琴座RR型星族群进行建模，并将所得的合成$K_s$波段PLR与观测进行比较。对于$α_{26}\equiv 10^{26}g_{ae}^2/4π=0.5$，轴子引起的预测PLR偏移与当前M3绝对零点校准的不确定性相当。
英文摘要
We investigate the impact of axions on the period-luminosity relation (PLR) of RR Lyrae stars. During the red giant branch phase, emission through the electron coupling cools the core, increasing its mass at ignition. The larger core produces more luminous horizontal-branch stars, systematically shifting the zero point of the RR Lyrae PLR toward brighter magnitudes. We model the RR Lyrae population of the globular cluster M3 using stellar evolution and pulsation calculations tailored to its age and composition, and compare the resulting synthetic $K_s$-band PLR with observations. For $α_{26}\equiv 10^{26}g_{ae}^2/4π=0.5$, the axion-induced shift in the predicted PLR is comparable to the current uncertainty in the absolute M3 zero-point calibration.
CommentsSeven paged, two figures, one table
