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Proceedings Paper

IOTA observation of the circumstellar envelope of R CrB
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Paper 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.

Paper Details

Date Published: 21 February 2003
PDF: 4 pages
Proc. SPIE 4838, Interferometry for Optical Astronomy II, (21 February 2003); doi: 10.1117/12.458931
Show Author Affiliations
Keiichi Ohnaka, Max-Planck-Institut fuer Radioastronomie (Germany)
Udo Beckmann, Max-Planck-Institut fuer Radioastronomie (Germany)
Jean-Philippe Berger, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Michael K. Brewer, Univ. of Massachusetts/Amherst (United States)
Karl-Heinz Hofmann, Max-Planck-Institut fuer Radioastronomie (Germany)
Marc G. Lacasse, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Victor Malanushenko, Crimean Astrophysical Observatory (Ukraine)
Rafael Millan-Gabet, Harvard-Smithsonian Ctr. for Astrophysics (United States)
John D. Monnier, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Ettore Pedretti, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Dieter Schertl, Max-Planck-Institut fuer Radioastronomie (Germany)
F. Peter Schloerb, Univ. of Massachusetts/Amherst (United States)
Victor Shenavrin, Sternberg Astronomical Institute (Russia)
Wesley A. Traub, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Gerd Weigelt, Max-Planck-Institut fuer Radioastronomie (Germany)
Boris Yudin, Sternberg Astronomical Institute (Russia)

Published in SPIE Proceedings Vol. 4838:
Interferometry for Optical Astronomy II
Wesley A. Traub, Editor(s)

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