论文标题
对经典头孢虫的磁性调查的第一结果
First results of a magnetic survey of classical Cepheids
论文作者
论文摘要
我们报告了最近对最明亮的25个经典头孢虫的磁性调查来报告最近的Espadons和Harpspol光谱观测。在迄今观察到的15个目标中的八个中，检测到了Stokes $ V $磁性签名。 Stokes $ v $配置文件显示出多种形态，相关的纵向野外测量值1 G.许多Stokes $ v $ profiles在正常的Zeeman效应的背景下很难解释。它们由正或负圆极化的大约单极单或双叶组成。我们假设这些不寻常的特征是由于大气速度或磁场梯度改变的采面效应所致。相比之下，北极星的Stokes $ v $概况在质量上看起来与非策略凉爽超级巨人的复杂磁性特征相似，这可能是由于这两颗恒星的搏动幅度较低。
We report recent ESPaDOnS and HARPSpol spectropolarimetric observations from our ongoing magnetic survey of the brightest twenty-five classical Cepheids. Stokes $V$ magnetic signatures are detected in eight of fifteen targets observed to date. The Stokes $V$ profiles show a diversity of morphologies with weak associated longitudinal field measurements of order 1 G. Many of the Stokes $V$ profiles are difficult to interpret in the context of the normal Zeeman effect. They consist of approximately unipolar single or double lobe(s) of positive or negative circular polarization. We hypothesize that these unusual signatures are due to the Zeeman effect modified by atmospheric velocity or magnetic field gradients. In contrast, the Stokes $V$ profiles of Polaris and MY Pup appear qualitatively similar to the complex magnetic signatures of non-pulsating cool supergiants, possibly due to the low pulsation amplitudes of these two stars.
