标题： 脉动天文中的核心磁场和旋转特征在数百个低光度红巨星中的表现 显示英文标题

标题： Asteroseismic Signatures of Core Magnetism and Rotation in Hundreds of Low-Luminosity Red Giants

摘要： 红巨星恒星拥有类似太阳的振荡，这些振荡具有混合特性，对在外层对流区和内部深处的条件都很敏感。 这些模式的特性对核心旋转和磁场都很敏感。 虽然已经大规模进行了前者的星震学研究，但后者的研究目前仅限于几十颗恒星。 我们的目标是制作第一个包含磁场和旋转扰动的大目录。 我们通过设计一种自动方法直接拟合功率谱来联合约束这些参数。 我们将该方法成功应用于302颗低光度的红巨星。 我们发现核心旋转速率存在明显的双峰性。 主要峰值在$\delta \nu_{\mathrm{rot}}$ = 0.32 $\mu$Hz，次要峰值在$\delta \nu_{\mathrm{rot}}$ = 0.47 $\mu$Hz。 将我们的结果与文献值结合，我们发现比群体平均旋转更快的恒星百分比随着演化状态而增加。 我们在23颗恒星中测量到了2$\sigma$显著性的磁场分裂。 虽然最极端的磁场分裂值出现在质量> 1.1M$_{\odot}$的恒星中，这意味着它们以前曾有对流核心，但在较低质量的恒星中也测量到了小但统计上显著的磁场分裂。 旋转分裂多重态频率之间的不对称性之前已被用于诊断磁场扰动的存在。 我们发现，在有显著磁场扰动检测的恒星中，43%没有表现出强烈的不对称性。 我们没有发现旋转和磁场参数之间有强烈的相关性。 显示英文摘要

摘要： Red Giant stars host solar-like oscillations which have mixed character, being sensitive to conditions both in the outer convection zone and deep within the interior. The properties of these modes are sensitive to both core rotation and magnetic fields. While asteroseismic studies of the former have been done on a large scale, studies of the latter are currently limited to tens of stars. We aim to produce the first large catalogue of both magnetic and rotational perturbations. We jointly constrain these parameters by devising an automated method for fitting the power spectra directly. We successfully apply the method to 302 low-luminosity red giants. We find a clear bimodality in core rotation rate. The primary peak is at $\delta \nu_{\mathrm{rot}}$ = 0.32 $\mu$Hz, and the secondary at $\delta \nu_{\mathrm{rot}}$ = 0.47 $\mu$Hz. Combining our results with literature values, we find that the percentage of stars rotating much more rapidly than the population average increases with evolutionary state. We measure magnetic splittings of 2$\sigma$ significance in 23 stars. While the most extreme magnetic splitting values appear in stars with masses > 1.1M$_{\odot}$, implying they formerly hosted a convective core, a small but statistically significant magnetic splitting is measured at lower masses. Asymmetry between the frequencies of a rotationally split multiplet has previously been used to diagnose the presence of a magnetic perturbation. We find that of the stars with a significant detection of magnetic perturbation, 43\% do not show strong asymmetry. We find no strong evidence of correlation between the rotation and magnetic parameters.