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Nils Ryde. Photo.

Nils Ryde

Professor

Nils Ryde. Photo.

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

Author

  • O. Kochukhov
  • U. Heiter
  • N. Piskunov
  • Nils Ryde
  • B. Gustafsson
  • S. Bagnulo
  • B. Plez

Summary, in English

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.

Department/s

  • Lund Observatory

Publishing year

2009

Language

English

Pages

124-129

Publication/Series

AIP Conference Proceedings

Volume

1094

Document type

Conference paper

Publisher

American Institute of Physics (AIP)

Topic

  • Astronomy, Astrophysics and Cosmology

Conference name

Cool stars, stellar systems and the sun. Proceedings of the 15th Cambridge Workshop

Conference date

2008-07-21 - 2008-07-25

Status

Published

Research group

  • Observational and Theoretical Astrophysics

ISBN/ISSN/Other

  • ISBN: 978-0-7354-0627-8