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The massive interacting binary RY Scuti is an important representative of anactive mass-transferring system that is changing before our eyes and which maybe an example of the formation of a Wolf-Rayet star through tidal stripping.Utilizing new and previously published spectra, we present examples of how anumber of illustrative absorption and emission features vary during the binaryorbit. We identify spectral features associated with each component, calculatea new, double-lined spectroscopic binary orbit, and find masses of 7.1 +/- 1.2M_sun for the bright supergiant and 30.0 +/- 2.1 M_sun for the hidden massivecompanion. Through tomographic reconstruction of the component spectra from thecomposite spectra, we confirm the O9.7 Ibpe spectral class of the brightsupergiant and discover a B0.5 I spectrum associated with the hidden massivecompanion; however, we suggest that the latter is actually the spectrum of thephotosphere of the accretion torus immediately surrounding the massivecompanion. We describe the complex nature of the mass loss flows from thesystem in the context of recent hydrodynamical models for beta Lyr, leading usto conclude RY Scuti has matter leaving the system in two ways: 1) a bipolaroutflow from winds generated by the hidden massive companion, and 2) mass fromthe bright O9.7 Ibpe supergiant flowing from the region near the L2 point tofill out a large, dense circumbinary disk. This circumbinary disk (radius ~ 1AU) may feed the surrounding double-toroidal nebula (radius ~ 2000 AU).

A Spectroscopic Study of Mass Outflows in the Interacting Binary RY Scuti