SIMBAD references

2009A&A...504.1021V - Astronomy and Astrophysics, volume 504, 1021-1029 (2009/9-4)

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

VIDA K., OLAH K., KHOVARI Z., KORHONEN H., BARTUS J., HURTA Z. and POSZTOBANYI K.

Abstract (from CDS):

We investigate the fast-rotating (Porb=Prot=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.

Abstract Copyright:

Journal keyword(s): stars: individual: V405 Andromedae - binaries: eclipsing - stars: activity - stars: chromospheres - starspots - stars: fundamental parameters

Simbad objects: 13

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2022.08.18-11:46:30

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