International Ultraviolet Explorer observations of the peculiar variable spectrum of the eclipsing binary R Arae

Astronomy and Astrophysics – Astronomy

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Eclipsing Binary Stars, Iue, Peculiar Stars, Stellar Spectrophotometry, Ultraviolet Spectroscopy, Variable Stars, Far Ultraviolet Radiation, Photosphere, Radial Velocity, Satellite Observation, Spaceborne Astronomy, Stellar Evolution

Scientific paper

The eclipsing binary system R Arae = HD 149730 is a relatively bright southern system with an orbital period of about 4.4 days. It is a single-lined spectroscopic binary. The spectral class of the primary component is B9 Vp. The system was included in a study of mass flow and evolution in close binary systems using the International Ultraviolet Explorer satellite (IUE). Four spectra in the wavelength range from 1150 to 1900 A were obtained with the far-ultraviolet SWP camera, and six spectra in the range from 1900 to 3200 range were obtained with the mid-ultraviolet LWR camera. The close binary R Arae exhibits very unusual ultraviolet spectra. It appears that no other close binary system, observed with any of the orbiting satellites, shows outside-eclipse ultraviolet continuum flux variations of this nature.

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