论文标题
苔丝观察到的热分子b恒星的星星学：发现两个新的重力模式脉动星星
Asteroseismology of hot subdwarf B stars observed with TESS: discovery of two new gravity mode pulsating stars
论文作者
论文摘要
TIC033834484和TIC309658435是长周期脉动脉冲B恒星，分别通过过渡系外行星调查卫星（TESS）广泛观察到（分别为675和621天）。高精度光度光曲线揭示了包括这两个恒星在内的40多种脉动模式的存在。我们发现的所有振荡频率都与重力（G）模式脉动相关，频率从80 $μ$ Hz（2 500 s）到400 $ $ $ $ Hz（12 000 s）。我们利用了包括渐近周期间距和旋转频率多重组在内的星空震动工具，以识别脉冲模式。我们发现了两个目标的偶极子（L = 1）模式序列，并计算偶极模式的平均周期间距（$ΔP_{l = 1} $），这使我们能够识别模式。 TIC033834484的频率乘积可提供约64 d的旋转周期。从后续地面光谱学中，我们发现TIC \，033834484的有效温度为24 210 K（140），LOGG的表面重力= 5.28（03）和TIC309658435的有效温度为25 910 K（150），表面重力为LOGG = 5.48（03）。
TIC033834484 and TIC309658435 are long-period pulsating subdwarf B star, which were observed extensively (675 and 621 days, respectively) by the Transiting Exoplanet Survey Satellite (TESS). The high-precision photometric light curve reveals the presence of more than 40 pulsation modes including both stars. All the oscillation frequencies that we found are associated with gravity (g)-mode pulsations, with frequencies spanning from 80 $μ$Hz (2 500 s) to 400 $μ$Hz (12 000 s). We utilize the asteroseismic tools including asymptotic period spacings and rotational frequency multiplets in order to identify the pulsational modes. We found dipole (l = 1) mode sequences for both targets and calculate the mean period spacing of dipole modes ($ΔP_{l=1}$), which allows us to identify the modes. Frequency multiplets provide a rotation period of about 64 d for TIC033834484. From follow-up ground-based spectroscopy, we find that TIC\,033834484 has an effective temperature of 24 210 K (140), a surface gravity of logg = 5.28 (03) and TIC309658435 has an effective temperature of 25 910 K (150), a surface gravity of logg = 5.48 (03).
