论文标题
$β$ cephei脉动在高质量蚀系统中CW Cephei
$β$ Cephei Pulsations in the High-mass Eclipsing System CW Cephei
论文作者
论文摘要
CW CEP是早期的B型黯然失色的二进制，其质量测量精度优于1 \％。 We report the discovery of pulsation signatures in the TESS time-series data of the system observed during Sectors 17 and 18. Our binary modeling indicates that the target star is a partially-eclipsing detached system with masses of 12.95 $M_\odot$ and 11.88 $M_\odot$ and radii of 5.52 $R_\odot$ and 5.09 $R_\odot$ in an $ e $ = 0.0305的偏心轨道。与962 $ \ pm $ 453 PC的Gaia距离相比，到Eclipsing System的距离为928 $ \ pm $ 36 PC。在外部放弃部分的残留光曲线上应用多频分析，我们在两个频率区域中检测到13个重要信号。 1天以下的六个频率$^{ - 1} $似乎主要是轨道谐波和组合术语，或者由于二进制效果的去除不足而导致的侧be。相比之下，七个频率在2.73天$^{ - 1} $和5.34天$^{ - 1} $中聚集在$β$ CEP型脉动。我们的结果代表了$β$ CEP脉动的第二次发现，这些脉动具有精确质量的双层黯淡二进制文件，因此CW CEP是高质量恒星中星号模型的重要测试床。
CW Cep is an early B-type eclipsing binary with mass measurement precisions better than 1 \%. We report the discovery of pulsation signatures in the TESS time-series data of the system observed during Sectors 17 and 18. Our binary modeling indicates that the target star is a partially-eclipsing detached system with masses of 12.95 $M_\odot$ and 11.88 $M_\odot$ and radii of 5.52 $R_\odot$ and 5.09 $R_\odot$ in an eccentric orbit of $e$ = 0.0305. The distance to the eclipsing system, 928 $\pm$ 36 pc, is much more precise than the Gaia distance of 962 $\pm$ 453 pc. Applying multifrequency analyses to the residual light curve in the outside-eclipse part, we detected 13 significant signals in two frequency regions. Six frequencies below 1 day$^{-1}$ appeared to be mostly orbital harmonic and combination terms, or sidelobes due to insufficient removal of the binary effects. In contrast, seven frequencies clustered around 2.73 day$^{-1}$ and 5.34 day$^{-1}$ could be considered $β$ Cep-type pulsations. Our results represent the second discovery of $β$ Cep pulsations present in double-lined eclipsing binaries with precise masses and, hence, CW Cep serves as an important test-bed for the asteroseismic modeling of high-mass stars.
