FX UMa: A New Heartbeat Binary System with Linear and Nonlinear Tidal Oscillations and δ Sct Pulsations
FX UMa: A New Heartbeat Binary System with Linear and Nonlinear Tidal Oscillations and δ Sct Pulsations
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DOI：
10.3847/1538-3881/acdac9
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发表时间：
2022-12
期刊：
影响因子：
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通讯作者：
K. Wang 王;Anbing 安炳 Ren 任;M. F. Andersen;F. Grundahl;T. Chen 陈;P. Pallé
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文献类型：
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作者：
K. Wang 王;Anbing 安炳 Ren 任;M. F. Andersen;F. Grundahl;T. Chen 陈;P. Pallé
我们基于 TESS 光度测量和新获得的光谱观测结果对食双线双星 FX UMa 进行了详细分析。每个组成恒星的径向速度和大气参数是从 SONG 高分辨率光谱中获得的。与径向速度测量相结合，我们的光曲线建模产生了两个组件的绝对质量和半径。剩余光变曲线的傅立叶振幅谱共揭示了信噪比（S/N）≥4的103个频率，其中包括12个独立频率、17个轨道频率倍数（Nf orb）和74个组合频率。 10 个 S/N > 10 的 Nf 球峰具有非常高的振幅，可能是由于潮汐激发振荡 (TEO) 造成的。剩余的 Nf orb 峰 (4 ≤ S/N ≤ 10) 可能源自不完美的去除，或者它们实际上是真正的 TEO。四个非谐波频率可以配对并求和以给出轨道频率的精确谐波，这表明偏心双星系统 FX UMa 中存在非线性潮汐过程。 20~32 day−1 范围内的 8 个独立频率是 δ Scuti 脉动器的典型低阶压力模态。
We present a detailed analysis of an eclipsing double-lined binary FX UMa based on TESS photometry and newly acquired spectroscopic observations. The radial velocities and atmospheric parameters for each component star are obtained from the SONG high-resolution spectra. Combined with the radial-velocity measurements, our light-curve modeling yields absolute masses and radii of the two components. The Fourier amplitude spectrum of the residual light curve reveals a total of 103 frequencies with signal-to-noise ratio (S/N) ≥ 4, including 12 independent frequencies, 17 multiples of the orbital frequency (Nf orb), and 74 combination frequencies. Ten Nf orb peaks with S/N > 10 have very high amplitudes and are likely due to tidally excited oscillations (TEOs). The remaining Nf orb peaks (4 ≤ S/N ≤ 10) may be originated from the imperfect removal, or they are actually real TEOs. Four anharmonic frequencies can pair up and sum to give exact harmonics of the orbital frequency, suggesting the existence of nonlinear tidal processes in the eccentric binary system FX UMa. Eight independent frequencies in the range of 20–32 day−1 are typical low-order pressure modes of δ Scuti pulsators.