We report analysis of VRIJH photometry, and phase-resolved optical spectroscopy of the eclipsing DA white dwarf plus dMe dwarf binary QS Vir. Modeling of the photometric data yields an inclination of i=74.9±0.6 and a mass ratio of q=M2/M1=0.50±0.05. Our Doppler maps indicate the presence of material in the Roche lobe of the white dwarf, at a location near the M star, likely due to accretion from the stellar wind of the M star (as opposed to Roche-lobe overflow accretion). We also constructed images of the brightness distribution of the M star at different epochs which reveal the location of two stable active regions. Doppler tomography shows that the majority of the Hydrogen and Ca II H&K emission originates on the active M dwarf, likely distributed in two preferred activity longitudes, similar to active regions on BY Dra and FK Comae systems.
@article{arxiv.0912.0912,
title = {Activity on the M star of QS Vir},
author = {T. Ribeiro and S. Kafka and R. Baptista and C. Tappert},
journal= {arXiv preprint arXiv:0912.0912},
year = {2010}
}
Comments
29 pages, 8 figures, accepted to Astronomical Journal