Magnetic fields in M dwarf stars from high-resolution infrared spectra

被引：0
|
作者：
Kochukhov, O. [1 ]
Heiter, U. [1 ]
Piskunov, N. [1 ]
Ryde, N. [2 ]
Gustafsson, B. [1 ]
Bagnulo, S. [3 ]
Plez, B. [4 ]
机构：
[1] Uppsala Univ, Dept Phys & Astron, Uppsala, Sweden
[2] Lund Observ, Lund, Sweden
[3] Armagh Observ, Armagh, England
[4] Univ Montpellier, Montpellier, France
来源：
COOL STARS, STELLAR SYSTEMS AND THE SUN | 2009年 / 1094卷
关键词：
Stars: activity; Stars: atmospheres; Stars: magnetic fields; Stars: late-type; T-TAURI; TOPOLOGIES;
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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 anti 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.
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页码：124 / +
页数：2
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