Magnetic fields in M dwarf stars from high-resolution infrared spectra
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 (Refereed)
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.
, AIP Conference Proceedings, ISSN 0094-243X ; 1094
Low luminosity stars, subdwarfs, and brown dwarfs, X-ray spectra, Interplanetary magnetic fields, Star formation
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:uu:diva-171254DOI: 10.1063/1.3099081ISBN: 978-0-7354-0627-8OAI: oai:DiVA.org:uu-171254DiVA: diva2:510346
15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, 21–25 July 2008, St. Andrews (Scotland)