Magnetic geometries of Sun-like stars: exploring the mass-rotation plane

Abstract Sun-like stars are able to continuously generate a large-scale magnetic field through the action of a dynamo. Various physical parameters of the star are able to affect the dynamo output, in particular the rotation and mass. Using the NARVAL spectropolarimeter (Observatoire du Pic du Midi,...

Full description

Bibliographic Details
Published in:Proceedings of the International Astronomical Union
Main Authors: Petit, Pascal, Dintrans, B., Aurière, M., Catala, C., Donati, J.-F., Fares, R., Gastine, T., Lignières, F., Morgenthaler, A., Morin, J., Paletou, F., Ramirez, J., Solanki, S. K., Théado, S.
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press (CUP) 2008
Subjects:
Astronomy and Astrophysics
Space and Planetary Science
narval
Online Access:http://dx.doi.org/10.1017/s1743921309031068
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S1743921309031068
Description
Summary:Abstract Sun-like stars are able to continuously generate a large-scale magnetic field through the action of a dynamo. Various physical parameters of the star are able to affect the dynamo output, in particular the rotation and mass. Using the NARVAL spectropolarimeter (Observatoire du Pic du Midi, France), it is now possible to measure the large-scale magnetic field of solar analogues (i.e. stars very close to the Sun in the mass-rotation plane, including strict solar twins). From spectropolarimetric time-series, tomographic inversion enables one to reconstruct the field geometry and its progressive distortion under the effect of surface differential rotation. We show the first results obtained on a sample of main-sequence dwarfs, probing masses between 0.7 and 1.4 solar mass and rotation rates between 1 and 3 solar rotation rate.

Similar Items