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Magnetic fields in M dwarf stars from high-resolution infrared spectra
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
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2009 (English)In: COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, 2009, Vol. 1094, 124-129 p.Conference paper, Published paper (Refereed)
Abstract [en]

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.

Place, publisher, year, edition, pages
2009. Vol. 1094, 124-129 p.
Series
AIP Conference Proceedings, ISSN 0094-243X ; 1094
Keyword [en]
Low luminosity stars, subdwarfs, and brown dwarfs, X-ray spectra, Interplanetary magnetic fields, Star formation
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-171254DOI: 10.1063/1.3099081ISBN: 978-0-7354-0627-8 (print)OAI: oai:DiVA.org:uu-171254DiVA: diva2:510346
Conference
15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, 21–25 July 2008, St. Andrews (Scotland)
Available from: 2012-03-15 Created: 2012-03-15 Last updated: 2012-10-11Bibliographically approved

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Kochukhov, OlegHeiter, UlrikePiskunov, Nikolai

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