Full-orbit H-alpha emission in RW Tauri

David N. Vesper, R. K. Honeycutt
1993 Publications of the Astronomical Society of the Pacific  
Ha observations of the Algol system RW Tauri were obtained over a four-year period (1988 October-1992 at ~1 A resolution, with coverage over the full orbit. Strong single-peaked emission near orbital quadrature is easily seen in the raw spectra. Subtracting the stellar components' light reveals a second, weaker, often double-peaked emission component at almost all phases, at most epochs. An absorption component is seen just before and after primary eclipse. Visibility and velocities for the
more » ... ng emission place it between the stellar components, near the primary star. Depending on the epoch, this stronger emission has one of two distinct patterns in a velocity versus phase plot. The weaker emission feature's visibility and velocity indicate that it usually arises from a slowly rotating structure near the primary star, with a radial extent of at least 0.33 R x . A third feature (which we interpret as a transient ring) was present in 3 of 12 runs.
doi:10.1086/133224 fatcat:knmydfnslnfsxpcgsj5urlb3ru