Optical and infrared observations of RV Tauri stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Infrared Photometry, Radiant Flux Density, Stellar Spectrophotometry, Variable Stars, Visible Spectrum, Interstellar Extinction, Interstellar Matter, Optical Thickness, Stellar Envelopes

Scientific paper

The authors present optical and IR photometry of RV Tauri stars, much of which was obtained nearly simultaneously over the wavelength range 0.36 - 10 μm. From the dereddened optical-IR flux distributions they deduce stellar and (where appropriate) dust shell parameters. The deduced stellar colours are in good agreement with those inferred from optical spectroscopy. The Planck mean optical depths of the dusty RV Tauri stars range from 0.07 to 0.63, the corresponding circumstellar contributions to E(B-V) ranging from ≡0.02 to ≡0.2. The observations show that the flux distributions of oxygen- and carbon-rich types are indistinguishable photometrically, that some of these objects may have multiple dust shells and hence that dust production in RV Tauri stars probably occurs sporadically rather than continuously.

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