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IOTA observation of the circumstellar envelope of R CrB

Ohnaka, K. and Beckmann, U. and Berger, J.-P. and Brewer, M. K. and Hofmann, K.-H. and Lacasse, M. G. and Malanushenko, V. and Millan-Gabet, R. and Monnier, J. D. and Pedretti, E. and Schertl, D. and Schloerb, F. P. and Shenavrin, V. and Traub, W. A. and Weigelt, G. and Yudin, B. (2003) IOTA observation of the circumstellar envelope of R CrB. In: Interferometry for Optical Astronomy II. Proceedings of SPIE. No.4838. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 1068-1071. ISBN 9780819446176.

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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.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Berger, J.-P.0000-0001-5025-0428
Lacasse, M. G.0000-0001-8627-9708
Millan-Gabet, R.0000-0003-0447-5866
Monnier, J. D.0000-0002-3380-3307
Additional Information:© 2003 Society of Photo-optical Instrumentation Engineers (SPIE).
Subject Keywords:long-baseline interferometry, near-infrared, circumstellar matter, mass-loss, individual star (R CrB)
Series Name:Proceedings of SPIE
Issue or Number:4838
Record Number:CaltechAUTHORS:20190118-133057255
Persistent URL:
Official Citation:Keiichi Ohnaka, Udo Beckmann, Jean-Philippe Berger, Michael K. Brewer, Karl-Heinz Hofmann, Marc G. Lacasse, Victor Malanushenko, Rafael Millan-Gabet, John D. Monnier, Ettore Pedretti, Dieter Schertl, F. Peter Schloerb, Victor Shenavrin, Wesley A. Traub, Gerd Weigelt, 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
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92376
Deposited By: Tony Diaz
Deposited On:21 Jan 2019 22:15
Last Modified:16 Nov 2021 03:49

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