论文标题
单面脉动器co〜camelopardalis
The single-sided pulsator CO~Camelopardalis
论文作者
论文摘要
CO〜CAM（TIC 160268882）是要发现的第二个``单面脉冲''。这些恒星，一个半球的振幅明显高于恒星的另一侧。 CO〜CAM是由AM $δ$ 〜SCT主星组成的二进制恒星，其中$ t _ {\ rm eff} = 7070 \ pm 150 $ \，k，以及光谱未检测到的G主序列中等恒星。主要恒星的主要脉动侧以L $ _1 $点为中心。我们已经建模了光谱分布与径向速度结合的模型，并独立地{\ em tess}光曲线与径向速度相结合。这两种恒星都提供了极好的一致性和强大的系统参数。 $δ$ 〜SCT星是一个倾斜的脉动器，具有至少四个低径向载体（可能）的F〜模式，其脉动轴与恒星的潮汐轴（Apsides的线）一致。初步理论建模表明，模式必须在l $ _1 $点附近产生更大的磁通扰动，尽管这很难理解，因为脉动恒星并没有填充其Roche Lobe。应该开发出更详细的脉动脉冲恒星模型。这些新发现的单面脉动器为恒星中的天体物理推断提供了新的机会，这些恒星是近距离二元恒星中的倾斜脉动器。
CO~Cam (TIC 160268882) is the second ``single-sided pulsator'' to be discovered. These are stars where one hemisphere pulsates with a significantly higher amplitude than the other side of the star. CO~Cam is a binary star comprised of an Am $δ$~Sct primary star with $T_{\rm eff} = 7070 \pm 150$\,K, and a spectroscopically undetected G main-sequence secondary star. The dominant pulsating side of the primary star is centred on the L$_1$ point. We have modelled the spectral energy distribution combined with radial velocities, and independently the {\em TESS} light curve combined with radial velocities. Both of these give excellent agreement and robust system parameters for both stars. The $δ$~Sct star is an oblique pulsator with at least four low radial overtone (probably) f~modes with the pulsation axis coinciding with the tidal axis of the star, the line of apsides. Preliminary theoretical modelling indicates that the modes must produce much larger flux perturbations near the L$_1$ point, although this is difficult to understand because the pulsating star does not come near to filling its Roche lobe. More detailed models of distorted pulsating stars should be developed. These newly discovered single-sided pulsators offer new opportunities for astrophysical inference from stars that are oblique pulsators in close binary stars.
