论文标题
后AGB二进制89 Herculis的“第二太阳谱”
The "Second Solar Spectrum" of the post-AGB binary 89 Herculis
论文作者
论文摘要
我们根据高分辨率Catania Actania天体天文台光谱仪，Harps-North Polarimeter和echelle Spectropolopolopolorimetric设备的数据获得了基于高分辨率Catania Astania catania catania catania catania catania catania catania catania catania catania catania catania catania catania catania，对恒星观察。 吸收中的单个大气线清楚地检测到的线性极化的特征是复杂的Q和U形态，这些形态与系统的轨道周期是可变的。高斯级磁场，由于脉动，热点和散射在折叠环境中的连续性去极化，被排除在观察到的极化的可能性。 在光学泵送机制的背景下，我们建议恒星辐射场的各向异性在近距离二进制伴侣的推动下，可能是光谱线极化的周期性特性的原因。 我们得出的结论是，高分辨率线性光谱法可能是研究凉爽和进化恒星的非球形包膜的重要诊断工具。
We report a spectropolarimetric study of the post-AGB binary system 89 Herculis, based on data acquired with the high-resolution Catania Astrophysical Observatory Spectropolarimeter, the HArps-North POlarimeter and the Echelle SpectroPolarimetric Device for the Observation of Stars. The linear polarization clearly detected across single atmospheric lines in absorption is characterized by complex Q and U morphologies that are variable with the orbital period of the system. Gauss-level magnetic fields, continuum depolarization due to pulsations, hot spots and scattering in the circumstellar environment were excluded as possible origin of the observed polarization. In the context of the optical pumping mechanism, we suggest that the anisotropy of the stellar radiation field, fuelled by the close binary companion, can be responsible of the observed periodic properties of the spectral line polarization. We conclude that high resolution linear spectropolarimetry could be an important diagnostic tool in the study of aspherical envelopes of cool and evolved stars.
