Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105..731v&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 105, no. 689, p. 731-747.
Astronomy and Astrophysics
Astronomy
16
Eclipsing Binary Stars, Emission Spectra, H Alpha Line, Stellar Orbits, Stellar Systems, Spectral Line Width, Stellar Mass Accretion, Stellar Models, Stellar Rotation, Stellar Spectra
Scientific paper
H-alpha observations of the Algol system RW Tauri were obtained over a four-year period (October 1988-September 1992) at about 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 strong 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(1). A third feature (which we interpret as a transient ring) was present in 3 of 12 runs.
Honeycutt Kent R.
Vesper David N.
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