Molecular magnetic dichroism in spectra of white dwarfs
Molecular magnetic dichroism in spectra of white dwarfs
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DOI：
10.1103/physrevlett.99.091101
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发表时间：
2007-08-31
影响因子：
8.6
通讯作者：
Piirola, V.
中科院分区：
文献类型：
--
作者：
Berdyugina, S. V.;Berdyugin, A. V.;Piirola, V.
我们提出了新的计算磁二向色性出现在分子带中的存在下，一个强磁场，扰动分子的内部结构，并导致净极化由于Paschen-Back效应。在此基础上，我们分析了冷磁富氦白色矮星G99-37的新的偏振光谱观测，它在其光谱中显示出强偏振的分子带。除了先前已知的C-2 Swan和CH A-X系统的分子带之外，我们还发现了390 nm处的紫色CH B-X带和360 nm处的C-2 Deslandres-d 'Azambuja带的有力证据。结合我们的模型计算的极化观测，我们推导出一个偶极磁场的7.5 +/- 0.5 MG的正极指向地球。我们的结论是，开发的技术是一个很好的工具，用于研究冷磁星上的磁场。
We present novel calculations of the magnetic dichroism appearing in molecular bands in the presence of a strong magnetic field, which perturbs the internal structure of the molecule and results in net polarization due to the Paschen-Back effect. Based on that, we analyze new spectropolarimetric observations of the cool magnetic helium-rich white dwarf G99-37, which shows strongly polarized molecular bands in its spectrum. In addition to previously known molecular bands of the C-2 Swan and CH A-X systems, we find a firm evidence for the violet CH B-X bands at 390 nm and C-2 Deslandres-d'Azambuja bands at 360 nm. Combining the polarimetric observations with our model calculations, we deduce a dipole magnetic field of 7.5 +/- 0.5 MG with the positive pole pointing towards the Earth. We conclude that the developed technique is an excellent tool for studying magnetic fields on cool magnetic stars.