IOTA observation of the circumstellar envelope of R CrB

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

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

SAMS UHI

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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.

Original language	English
Pages (from-to)	1068-1071
Journal	Interferometry for Optical Astronomy II
Volume	4838
Publication status	Published - 1 Feb 2003

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http://adsabs.harvard.edu/abs/2003SPIE.4838.1068O

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Ohnaka, K., Beckmann, U., Berger, J.-P., Brewer, M. K., Hofmann, K.-H., Lacasse, M. G., Malanushenko, V., Millan-Gabet, R., Monnier, J. D., Pedretti, E., Schertl, D., Schloerb, F. P., Shenavrin, V., Traub, W. A., Weigelt, G., & Yudin, B. (2003). IOTA observation of the circumstellar envelope of R CrB. Interferometry for Optical Astronomy II, 4838, 1068-1071. http://adsabs.harvard.edu/abs/2003SPIE.4838.1068O

@article{72f4ae6c700242d7abb98e607db66ad8,

title = "IOTA observation of the circumstellar envelope of R CrB",

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.",

author = "Keiichi Ohnaka and Udo Beckmann and Jean-Philippe Berger and Brewer, {Michael K.} and Karl-Heinz Hofmann and Lacasse, {Marc G.} and Victor Malanushenko and Rafael Millan-Gabet and Monnier, {John D.} and Ettore Pedretti and Dieter Schertl and Schloerb, {F. Peter} and Victor Shenavrin and Traub, {Wesley A.} and Gerd Weigelt and Boris Yudin",

year = "2003",

month = feb,

day = "1",

language = "English",

volume = "4838",

pages = "1068--1071",

journal = "Interferometry for Optical Astronomy II",

publisher = "SPIE",

}

Ohnaka, K, Beckmann, U, Berger, J-P, Brewer, MK, Hofmann, K-H, Lacasse, MG, Malanushenko, V, Millan-Gabet, R, Monnier, JD, Pedretti, E, Schertl, D, Schloerb, FP, Shenavrin, V, Traub, WA, Weigelt, G & Yudin, B 2003, 'IOTA observation of the circumstellar envelope of R CrB', Interferometry for Optical Astronomy II, vol. 4838, pp. 1068-1071. <http://adsabs.harvard.edu/abs/2003SPIE.4838.1068O>

TY - JOUR

T1 - IOTA observation of the circumstellar envelope of R CrB

AU - Ohnaka, Keiichi

AU - Beckmann, Udo

AU - Berger, Jean-Philippe

AU - Brewer, Michael K.

AU - Hofmann, Karl-Heinz

AU - Lacasse, Marc G.

AU - Malanushenko, Victor

AU - Millan-Gabet, Rafael

AU - Monnier, John D.

AU - Pedretti, Ettore

AU - Schertl, Dieter

AU - Schloerb, F. Peter

AU - Shenavrin, Victor

AU - Traub, Wesley A.

AU - Weigelt, Gerd

AU - Yudin, Boris

PY - 2003/2/1

Y1 - 2003/2/1

N2 - 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.

AB - 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.

M3 - Article

VL - 4838

SP - 1068

EP - 1071

JO - Interferometry for Optical Astronomy II

JF - Interferometry for Optical Astronomy II

ER -

IOTA observation of the circumstellar envelope of R CrB

Abstract

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