发现17颗新的具有磁分辨谱线的尖线Ap星
Discovery of 17 new sharp-lined Ap stars with magnetically resolved lines
摘要：
化学上特殊的A星（Ap）是恒星大气中原子元素扩散过程与磁场相互作用的极端例子。快速振荡的Ap星提供了在3D中研究这些过程的手段，同时对于研究A星中的脉动激发机制也很重要。作为第一次全面的，统一的，高分辨率的光谱调查的Ap星，我们正在进行在南半球的密歇根光谱目录作为目标选择的基础上，我们在这里报告发现17个新的磁性Ap星光谱解析塞曼组件，从中我们得出磁场模量在3 - 30千克。其中包括：1）目前已知的第二强磁性A星，2）一个具有磁性成分的双线Ap双星，3）一个丰度特别奇特和可变的A星。需要对这些恒星进行偏振测量，以限制它们的场几何形状，并确定它们的自转周期。我们还获得了Ap星HD 92499的磁场的额外测量结果。
英文摘要：
Chemically peculiar A stars (Ap) are extreme examples of the interaction of atomic element diffusion processes with magnetic fields in stellar atmospheres. The rapidly oscillating Ap stars provide a means for studying these processes in 3D and are at the same time important for studying the pulsation excitation mechanism in A stars. As part of the first comprehensive, uniform, high resolution spectroscopic survey of Ap stars, which we are conducting in the southern hemisphere with the Michigan Spectral Catalogues as the basis of target selection, we report here the discovery of 17 new magnetic Ap stars having spectroscopically resolved Zeeman components from which we derive magnetic field moduli in the range 3 - 30 kG. Among these are 1) the current second-strongest known magnetic A star, 2) a double-lined Ap binary with a magnetic component and 3) an A star with particularly peculiar and variable abundances. Polarimetry of these stars is needed to constrain their field geometries and to determine their rotation periods. We have also obtained an additional measurement of the magnetic field of the Ap star HD 92499.
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