Magnetic fields in M dwarf stars from high-resolution infrared spectra
Magnetic fields in M dwarf stars from high-resolution infrared spectra
复制标题
高分辨率红外光谱中 M 矮星的磁场
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
B. Plez
中科院分区：
文献类型：
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作者：
O. Kochukhov;U. Heiter;N. Piskunov;N. Ryde;B. Gustafsson;S. Bagnulo;B. Plez
磁场在活动M矮星的大气性质和变化中起着核心作用。关于这些天体磁场强度和结构的信息对于理解发电机机制和低质量恒星的磁驱动活动以及限制星星形成和演化的理论至关重要。我们已经开始了第一次系统的高分辨率调查磁敏感红外光谱线在M矮星使用CRIRES仪器在ESO VLT。我们已经完成了对35个活跃和不活跃M矮星样本的观测。在这里，我们报告的第一个结果，我们的项目，展示了一个清晰的检测磁分裂线的光谱中的几个M矮星。我们评估诊断潜力的不同塞曼敏感线在所观察到的光谱区域和应用光谱合成模型来推断选定的M矮星的磁场特性。
Magnetic fields play a central role in the atmospheric properties and variability of active M dwarfs. Information on the strength and structure of magnetic fields in these objects is vital for understanding dynamo mechanisms and magnetically-driven activity of low-mass stars, and for constraining theories of star formation and evolution. We have initiated the first systematic high-resolution survey of magnetically sensitive infrared spectral lines in M dwarf stars using the CRIRES instrument at the ESO VLT. We have completed observations for a sample of 35 active and inactive M dwarfs. Here we report first results of our project, demonstrating a clear detection of magnetic splitting of lines in the spectra of several M dwarfs. We assess diagnostic potential of different Zeeman-sensitive lines in the observed spectral region and apply spectrum synthesis modelling to infer magnetic field properties of selected M dwarfs.