21 February 2003 IOTA observation of the circumstellar envelope of R CrB
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Abstract
We report the first long-baseline interferometric observations of R CrB. The observations were carried out at the Infrared Optical Telescope Array (IOTA), using our new JHK beam combiner which enables us to record fringes simultaneously in the J-, H-, and K-bands. The circumstellar envelope of R CrB is resolved at a baseline of 21 m, and the K-band visibility is derived to be 0.61 ± 0.03 along a position angle of about 170 degrees. The visibility obtained with IOTA, as well as speckle visibilities with baselines up to 6 m and the spectral energy distribution (SED), are fitted with 2-component models consisting of the central star and an optically thin dust shell. The K-band visibilities predicted by the models are about 10% smaller than the visibility obtained with IOTA. However, given the simplifications adopted in our models and the complex nature of the object, this can be regarded as rough agreement. As a hypothesis to explain the small discrepancy, we propose that there might be a group of newly formed dust clouds, which might appear as a third visibility component.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Keiichi Ohnaka, Keiichi Ohnaka, Udo Beckmann, Udo Beckmann, Jean-Philippe Berger, Jean-Philippe Berger, Michael K. Brewer, Michael K. Brewer, Karl-Heinz Hofmann, Karl-Heinz Hofmann, Marc G. Lacasse, Marc G. Lacasse, Victor Malanushenko, Victor Malanushenko, Rafael Millan-Gabet, Rafael Millan-Gabet, John D. Monnier, John D. Monnier, Ettore Pedretti, Ettore Pedretti, Dieter Schertl, Dieter Schertl, F. Peter Schloerb, F. Peter Schloerb, Victor Shenavrin, Victor Shenavrin, Wesley A. Traub, Wesley A. Traub, Gerd Weigelt, Gerd Weigelt, Boris Yudin, Boris Yudin, } "IOTA observation of the circumstellar envelope of R CrB", Proc. SPIE 4838, Interferometry for Optical Astronomy II, (21 February 2003); doi: 10.1117/12.458931; https://doi.org/10.1117/12.458931
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