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Abstract: We report analysis of VRIJH photometry, and phase-resolved opticalspectroscopy of the eclipsing DA white dwarf plus dMe dwarf binary QS Vir.Modeling of the photometric data yields an inclination of $i = 74.9\pm0.6$ anda mass ratio of $q = M 2-M 1 = 0.50\pm0.05$. Our Doppler maps indicate thepresence of material in the Roche lobe of the white dwarf, at a location nearthe M star, likely due to accretion from the stellar wind of the M star asopposed to Roche-lobe overflow accretion. We also constructed images of thebrightness distribution of the M star at different epochs which reveal thelocation of two stable active regions. Doppler tomography shows that themajority of the Hydrogen and Ca II HandK emission originates on the active Mdwarf, likely distributed in two preferred activity longitudes, similar toactive regions on BY Dra and FK Comae systems.



Author: T. Ribeiro, S. Kafka, R. Baptista, C. Tappert

Source: https://arxiv.org/



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