Surface evolution in stable magnetic fields: the case of the fully convective dwarf V374 Peg

Details Surface evolution in stable magnetic fields: the case of the fully convective dwarf V374 Peg Surface evolution in stable magnetic fields: the case of the fully convective dwarf V374 Peg

2010-10-19

arxiv.org/abs/1010.4024v2

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

4 pages, 3 figures; Proceedings of IAU symposium 273, Physics of Sun and star spots, Ventura, California 22-26 August 2010

Scientific paper

We present BV(RI)_C photometric measurements of the dM4-type V374 Peg covering ~430 days. The star has a mass of ~0.28M_Sun, so it is supposed to be fully convective. Previous observations detected almost-rigid-body rotation and stable, axisymmetric poloidal magnetic field. Our photometric data agree well with this picture, one persistent active nest is found on the stellar surface. Nevertheless, the surface is not static: night-to-night variations and frequent flaring are observed. The flares seem to be concentrated on the brighter part of the surface. The short-time changes of the light curve could indicate emerging flux ropes in the same region, resembling to the active nests on the Sun. We have observed flaring and quiet states of V374 Peg changing on monthly timescale.

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