Photospheric and chromospheric activity in V405 And: An M dwarf binary with components on the two sides of the full convection limit

Details Photospheric and chromospheric activity in V405 And: An M dwarf binary with components on the two sides of the full convection limit Photospheric and chromospheric activity in V405 And: An M dwarf binary with components on the two sides of the full convection limit

2009-07-06

arxiv.org/abs/0907.1011v3

2009A&A...504.1021V

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

10 pages, 13 figures, published at A&A; labels in Fig. 2 changed

Scientific paper

10.1051/0004-6361/200912326

We investigate the fast-rotating (P_orb=P_rot=0.465d), active dwarf binary V405 And (M0V+M5V) using photometric BV(RI)_C and optical spectroscopic data. The light variation is caused by the combined effect of spottedness and binarity with a small eclipse. We estimate the system parameters from the available light and radial velocity curves. Three flare events occurred during the observations: two were found in the spectroscopic data and one was observed photometrically in BV(RI)_C colours. An interesting eruptive phenomenon emerged from the photometric measurements that can be interpreted as a series of post-flare eruptions lasting for at least 3 orbits (rotations) of the system, originating from trans-equatorial magnetic loops, which connect the active regions in the two hemispheres. The two components of V405 And have masses well over and below the theoretical limit of full convection. This rare property makes the binary an ideal target for observing and testing models for stellar dynamo action.

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