We report the frequency analysis of a known roAp star, HD 86181 (TIC 469246567), with new inferences from Transiting Exoplanet Survey Satellite (TESS) data. We derive the rotation frequency to be νrot = 0.48753 ± 0.00001 d−1. The pulsation frequency spectrum is rich, consisting of two doublets and one quintuplet, which we interpret to be oblique pulsation multiplets from consecutive, high-overtone dipole, quadrupole, and dipole modes. The central frequency of the quintuplet is 232.7701 d−1 (2.694 mHz). The phases of the sidelobes, the pulsation phase modulation, and a spherical harmonic decomposition all show that the quadrupole mode is distorted. Following the oblique pulsator model, we calculate the rotation inclination, i, and magnetic obliquity, β, of this star, which provide detailed information about the pulsation geometry. The i and β derived from the best fit of the pulsation amplitude and phase modulation to a theoretical model, including the magnetic field effect, slightly differ from those calculated for a pure quadrupole, indicating the contributions from ℓ = 4, 6, 8,... are small. Non-adiabatic models with different envelope convection conditions and physics configurations were considered for this star. It is shown that models with envelope convection almost fully suppressed can explain the excitation at the observed pulsation frequencies.

中文翻译：

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在 roAp 星 HD 86181 中发现多个 p 模式脉动频率

我们报告了已知的 roAp 恒星 HD 86181 (TIC 469246567) 的频率分析，以及来自凌日系外行星调查卫星 (TESS) 数据的新推论。我们推导出旋转频率为 νrot = 0.48753 ± 0.00001 d-1。脉动频谱丰富，由两个双峰和一个五重峰组成，我们将其解释为来自连续、高泛音偶极子、四极子和偶极子模式的倾斜脉动多重峰。五重音的中心频率为 232.7701 d−1 (2.694 mHz)。旁瓣的相位、脉动相位调制和球谐分解都表明四极模式失真。根据倾斜脉动模型，我们计算了这颗恒星的自转倾角 i 和磁倾角 β，它们提供了有关脉动几何形状的详细信息。从脉动幅度和相位调制与理论模型（包括磁场效应）的最佳拟合得出的 i 和 β 与为纯四极子计算的结果略有不同，表明 ℓ = 4、6、8 的贡献。 ..很小。这颗恒星考虑了具有不同包络对流条件和物理配置的非绝热模型。结果表明，几乎完全抑制包络对流的模型可以解释观察到的脉动频率下的激发。这颗恒星考虑了具有不同包络对流条件和物理配置的非绝热模型。结果表明，几乎完全抑制包络对流的模型可以解释观察到的脉动频率下的激发。这颗恒星考虑了具有不同包络对流条件和物理配置的非绝热模型。结果表明，几乎完全抑制包络对流的模型可以解释观察到的脉动频率下的激发。