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Paper: Low-Mass Eclipsing Binaries as Constraints for Stellar Structure Models
Volume: 435, Binaries – Key to Comprehension of the Universe
Page: 141
Authors: Morales, J. C.; Gallardo, J.; Ribas, I.; Jordi, C.; Baraffe, I.; Chabrier, G.; Vilardell, F.
Abstract: In recent years, eclipsing binary systems have revealed that models predict ∼10 %smaller stellar radii and ∼5 % hotter effective temperatures than those observed for low-mass stars (below 1 Msun). These differences are commonly attributed to the magnetic activity present in these stars, which is enhanced by its high spin velocity due to the synchronization with the orbital motion. This activity may produce several changes to the structure of stars due to the modification of the efficiency of convection or the appearance of surface spots. Here we compare the effect that these two features produce on stellar structure models. Furthermore, systematic effects on fits to light curves due to photospheric spots are also checked. Our results indicate that if spots appear preferentially at polar latitudes, as shown in Doppler tomography images, discrepancies could be explained assuming a ∼30 % spot coverage on active stars.
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