arXiv 1402.42982014-02-18astro-ph.SR

Ap星化学丰度和磁场结构的同步测绘

Simultaneous mapping of chemical abundances and magnetic field structure in Ap stars

Theresa Lueftinger

备注：: 10 pages; invited review, to appear in the proceedings of the conference "Putting A Stars into Context: Evolution, Environment, and Related Stars"

摘要：

磁性A星代表了大约$5\%$的上主序星，并表现出高度有序，非常稳定，往往非常强的磁场。它们经常显示出与恒星自转同步的亮度和谱线轮廓变化，这被认为是由恒星大气中的原子扩散产生的，这些原子扩散由多kG的磁场稳定。近年来，随着多普勒成像技术和磁多普勒成像技术的发展和应用，以及高精度光谱和分光偏振测量数据的获得，基于全斯托克斯矢量观测的Ap星化学丰度和磁场结构的同时测绘变得越来越详细。在这里，我将审查国家的最先进的理解Ap星的斑点和它们的关系，磁场，多普勒和磁多普勒成像的发展成为最强大的天体物理遥感方法和物理的Ap星的大气，我们可以推断出从同步映射的磁场结构和化学丰度。

英文摘要：

Magnetic A stars represent about $5\%$ of the upper main sequence stars and exhibit highly ordered, very stable and often very strong magnetic fields. They frequently show both, brightness- and spectral line profile variations synchronised to stellar rotation, which are believed to be produced by atomic diffusion operating in the stars' atmospheres, that are stabilized by multi-kG magnetic fields. In recent years, with the development and the application of the Doppler- and magnetic Doppler imaging technique and the availability of high precision spectroscopic and spectropolarimetric data, it has became possible to map chemical abundances and magnetic field structures of Ap stars simultaneously and in more and more detail, based on full Stokes vector observations. Here I will review the state-of-the-art in understanding Ap star spots and their relation to magnetic fields, the development of Doppler- and magnetic Doppler imaging into one of the most powerful astrophysical remote sensing methods and the physics of Ap stars atmospheres we can deduce from the simultaneous mapping of magnetic field structure and chemical abundances.

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