论文标题
潮汐激发模式和$δ$ scuti脉动在Eclipsing Triple Star IM Persei中
Tidally Excited Modes and $δ$ Scuti Pulsations in the Eclipsing Triple Star IM Persei
论文作者
论文摘要
IM PER是一个三星级系统，其对成对的质量和半径在1 \％以内精确。程序目标的苔丝光曲线表现出具有MMAG级幅度的部分蚀和多个振荡。发现振荡会影响日食的时间测量。高质量苔丝数据的二进制建模表明，三重系统的远程组件是双矮人，参数为$ m_2 $/$ m_1 $ = 0.995，$ r_2 $/$ r_1 $ = 0.901 $ = 0.901，和$δ$ k中的k（$ e $ = 0.049），独立配置。 $ l_3 $ = 0.054的第三灯可能主要来自G型三级伴侣。我们的预测视差为1.52 $ \ pm $ 0.09 MAS与Gaia的测量1.52 $ \ pm $ 0.05 MAS同时发生。对外放生残差的多频分析揭示了22个重要的脉动信号：重力模式区域中有4个（0.03 $ -2.22天$^{ - 1} $）和18个在压力模式区域（9.19 $ - $ -25.12 Day $^{ - 1} $）。在低频中，$ f_ {11} $和$ f_ {14} $是轨道谐波，可以识别为潮汐激发模式。高频的脉动周期和常数，以及头孢杆菌不稳定性带中的位置表明IM PER的脉动分量是$δ$ SCT变量。
IM Per is a triple star system whose eclipsing pair masses and radii are accurate to within 1 \%. The TESS light curve of the program target exhibits partial eclipses and multiple oscillations with mmag-level amplitudes. It is found that the oscillations affect eclipse timing measurements. Binary modeling of the high-quality TESS data indicates that the eclipsing components of the triple system are twin dwarfs with parameters of $M_2$/$M_1$ = 0.995, $R_2$/$R_1$ = 0.901, and $Δ$($T_{\rm eff,1}$--$T_{\rm eff,2}$) = 12 K in an eccentric ($e$ = 0.049), detached configuration. The third light of $l_3$ = 0.054 may mostly come from a G-type tertiary companion. Our predicted parallax of 1.52 $\pm$ 0.09 mas is concurrent with the Gaia measurement of 1.52 $\pm$ 0.05 mas. Multifrequency analysis of the outside-eclipse residuals reveals 22 significant pulsation signals: four in the gravity-mode region (0.03$-$2.22 day$^{-1}$) and 18 in the pressure-mode region (9.19$-$25.12 day$^{-1}$). Of the low frequencies, $f_{11}$ and $f_{14}$ are orbital harmonics that can be identified as tidally excited modes. The pulsation periods and constants for the high frequencies, and the position in the Cepheid instability strip demonstrate that the pulsating component of IM Per is a $δ$ Sct variable.
