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Magnetic fields in M-dwarfs from high-resolution infrared spectroscopy

Published online by Cambridge University Press:  07 August 2014

D. Shulyak ,
A. Reiners ,
U. Seemann ,
O. Kochukhov  and
N. Piskunov
D. Shulyak
Affiliation:
Institute of Astrophysics, Georg-August University, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany
A. Reiners
Affiliation:
Institute of Astrophysics, Georg-August University, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany
U. Seemann
Affiliation:
Institute of Astrophysics, Georg-August University, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany
O. Kochukhov
Affiliation:
Department of Physics and Astronomy, Uppsala University, Box 515, 751 20, Uppsala, Sweden
N. Piskunov
Affiliation:
Department of Physics and Astronomy, Uppsala University, Box 515, 751 20, Uppsala, Sweden
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Abstract

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Accurate spectroscopic measurements of magnetic fields in low mass stars remain challenging because of their cool temperatures, strong line blending, and often fast rotation. This is why previous estimates were based either on the analysis of only a few lines or made use of some indirect techniques. This frequently led to noticeable scatter in obtained results. In this talk I will present and discuss new results on the determination of the intensity and geometry of the magnetic fields in M-dwarfs using IR observations obtained with CRIRES@VLT. The instrument provides unprecedented data of high resolution (R = 100 000) which is crucial for resolving individual magnetically broadened molecular and atomic lines. Such an in-depth analysis based on direct magnetic spectral synthesis opens a possibility to deduce both field intensity and geometry avoiding most of the limitation and assumptions made in previous studies.

Keywords

stars: atmospheres – stars: low-mass – stars: magnetic field
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S302: Magnetic Fields throughout Stellar Evolution , August 2013 , pp. 170 - 173
Copyright
Copyright © International Astronomical Union 2014 

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