Large-scale magnetic topologies of M dwarfs

Details Large-scale magnetic topologies of M dwarfs Large-scale magnetic topologies of M dwarfs

2008-09-26

arxiv.org/abs/0809.4564v1

AIP Conf. Proc., 1094,140-145, 2009

Astronomy and Astrophysics

Astrophysics

6 pages, proceedings of Cool Stars 15, St Andrews, July 2008, to be published in the Conference Proceedings Series of the AIP

Scientific paper

10.1063/1.3099084

We present here the first results of a spectropolarimetric analysis of a small sample (about 20) of active stars ranging from spectral type M0 to M8, which are either fully-convective or possess a very small radiative core. This study aims at providing new constraints on dynamo processes in fully-convective stars. Results for stars with spectral types M0-M4 -- i.e. with masses above or just below the full convection threshold (about 0.35Msun) -- are presented. Tomographic imaging techniques allow us to reconstruct the surface magnetic topologies from the rotationally modulated time-series of circularly polarised profiles. We find strong differences between partly and fully convective stars concerning magnetic field topology and characteristic scales, and differential rotation. Our results suggest that magnetic field generation in fully convective stars relies on different dynamo processes than those acting in the Sun and other partly convective stars, in agreement with theoretical expectations.

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