Magnetic fields of M dwarfs
| Autor: | Oleg Kochukhov |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
low mass
FOS: Physical sciences Context (language use) magnetic field Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics spectroscopic rotation symbols.namesake Astronomi astrofysik och kosmologi Astrophysics::Solar and Stellar Astrophysics Astronomy Astrophysics and Cosmology Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics Physics Zeeman effect activity Astronomy Astronomy and Astrophysics Stars Techniques Magnetic field interiors Planetary science Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science symbols atmospheres Terrestrial planet Astrophysics::Earth and Planetary Astrophysics polarimetric Circumstellar habitable zone Dynamo |
| Popis: | Magnetic fields play a fundamental role for interior and atmospheric properties of M dwarfs and greatly influence terrestrial planets orbiting in the habitable zones of these low-mass stars. Determination of the strength and topology of magnetic fields, both on stellar surfaces and throughout the extended stellar magnetospheres, is a key ingredient for advancing stellar and planetary science. Here modern methods of magnetic field measurements applied to M-dwarf stars are reviewed, with an emphasis on direct diagnostics based on interpretation of the Zeeman effect signatures in high-resolution intensity and polarisation spectra. Results of the mean field strength measurements derived from Zeeman broadening analyses as well as information on the global magnetic geometries inferred by applying tomographic mapping methods to spectropolarimetric observations are summarised and critically evaluated. The emerging understanding of the complex, multi-scale nature of M-dwarf magnetic fields is discussed in the context of theoretical models of hydromagnetic dynamos and stellar interior structure altered by magnetic fields. Comment: 59 pages, 17 figures; Invited review article accepted for publication by The Astronomy and Astrophysics Review |
| Databáze: | OpenAIRE |
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