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Poster De Conférence Année : 2016

The Magnetic Field Geometry of Cool Stars

Moira Jardine
Julien Morin
Ian Waite
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  • PersonId : 1009092

Résumé

Zeeman-Doppler imaging has been used to map the large-scale surface magnetic fields of cool stars across a wide range of stellar masses and rotation periods. The derived field geometries are surprising, with many stars showing strong azimuthal fields that are not observed on the Sun. In this poster, using 100 magnetic maps of over 50 stars, we present results showing how the magnetic field geometry of cool stars varies as a function of fundamental parameters. The stellar mass, and hence internal structure, critically influences the field geometry, although this is modified by the stellar rotation rate. We discuss the implications of these results for dynamo theory and the nature of stellar magnetic activity.
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Dates et versions

hal-02007573 , version 1 (05-02-2019)

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Victor See, Moira Jardine, Aline A. Vidotto, Jean-François Donati, Colin P. Folsom, et al.. The Magnetic Field Geometry of Cool Stars. The 19th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (CS19), Jun 2016, Uppsala, Sweden. . ⟨hal-02007573⟩
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