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We have developed a systematic procedure to study the disks in Algol-typebinaries using spectroscopic analysis, synthetic spectra, and tomography. Weanalyzed 119 H-alpha spectra of TT Hya, an Algol-type eclipsing interactingbinary, collected from 1985-2001. The new radial velocities enabled us toderive reliable orbital elements, including a small non-zero eccentricity, andto improve the accuracy of the absolute dimensions of the system. Highresolution IUE spectra were also analyzed to study the formation of theultraviolet lines and continuum. Synthetic spectra of the iron curtain usingour new shellspec program enabled us to derive a characteristic disktemperature of 7000K. We have demonstrated that the UV emission lines seenduring total primary eclipse cannot originate from the accretion disk, but mostlikely arise from a hotter disk-stream interaction region.  The synthetic spectra of the stars, disk, and stream allowed us to derive alower limit to the mass transfer rate of 2e-10 solar masses per year. Dopplertomography of the observed H-alpha profiles revealed a distinct accretion disk.The difference spectra produced by subtracting the synthetic spectra of thestars resulted in an image of the disk, which virtually disappeared once thecomposite synthetic spectra of the stars and disk were used to calculate thedifference spectra. An intensity enhancement of the resulting tomogram revealedimages of the gas stream and an emission arc. We successfully modeled the gasstream using shellspec and associated the emission arc with an asymmetry in theaccretion disk.Comment: 46 pages, 15 figures, 6 tables, accepted by Ap

Revealing the Nature of Algol Disks through Optical and UV Spectroscopy, Synthetic Spectra, and Tomography of TT Hydrae