The effect of activity on the fundamental properties of low-mass stars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

The analyses of eclipsing binary systems unveiled differences between the observed radii and effective temperatures of low-mass stars and those predicted by stellar models. These discrepancies have been attributed to different factors, notably to the high levels of magnetic activity present on these stars. We have tested the effect of these activity both on models and observations and we conclude that spots have a significant effect on the determination of the radii of the stars as well as on its evolution. Assuming the existence of polar spots, agreement between models and observations is found for a spot coverage of about 35% of the stellar surface, that can cause a systematic deviation on the determination of the stellar radius of about 3%. In addition, the reduction of the convective transport efficiency on fast rotating stars may explain another about 4% radius discrepancy.

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