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We have used 2D back-projection Doppler tomography as a tool to examine theinfluence of gravitational and magnetic phenomena in interacting binaries whichundergo mass transfer from a magnetically-active star onto a non-magnetic mainsequence star. This multi-tiered study of over 1300 time-resolved spectra of 13Algol binaries involved calculations of the predicted dynamical behavior of thegravitational flow and the dynamics at the impact site, analysis of thevelocity images constructed from tomography, and the influence on the tomogramsof orbital inclination, systemic velocity, orbital coverage, and shadowing. TheH$\alpha$ tomograms revealed eight sources: chromospheric emission, a gasstream along the gravitational trajectory, a star-stream impact region, a bulgeof absorption or emission around the mass-gaining star, a Keplerian accretiondisk, an absorption zone associated with hotter gas, a disk-stream impactregion, and a hot spot where the stream strikes the edge of a disk. Wedescribed several methods used to extract the physical properties of theemission sources directly from the velocity images, including S-wave analysis,the creation of simulated velocity tomograms from hydrodynamic simulations, andthe use of synthetic spectra with tomography to sequentially extract theseparate sources of emission from the velocity image. In summary, thetomography images have revealed results that cannot be explained solely bygravitational effects: chromospheric emission moving with the mass-losing star,a gas stream deflected from the gravitational trajectory, and alternatingbehavior between stream state and disk state. Our results demonstrate thatmagnetic effects cannot be ignored in these interacting binaries.

Images of Gravitational and Magnetic Phenomena Derived from 2D Back-Projection Doppler Tomography of Interacting Binary Stars