Publications
of the
MPIfR Optical & Infrared Interferometry Group

K.-H. Hofmann, U. Beckmann, T. Blöcker, K. Ohnaka, D. Schertl, G. Weigelt, M. Brewer, P. Schloerb, Y.N. Efimov, V. Shenavrin, B. Yudin, J.-P. Berger, M. Lacasse, R. Millan-Gabet, J. Monnier, S. Morel, E. Pedretti, W. Traub, V. Malanushenko, B. Mennesson, M. Scholz

Near-infrared IOTA interferometry of the symbiotic star CH Cyg

Astronomische Gesellschaft Abstract Series (AGM 19, P41)
Der kosmische Materiekreislauf
Annual Scientific Meeting of the Astronomische Gesellschaft, Sep 23-28, 2002, Berlin, Germany

Abstract

We present near-infrared IOTA interferometry of the symbiotic star CH Cyg with the IOTA interferometer and our new JHK-band beam combiner. Spectrally dispersed Michelson interferograms were simultaneous recorded in the J-, H-, and K-bands. The spectrograph of the beam combiner consists of an anamorphotic lens system and a grism. We observed CH Cyg with the baselines 17 m, 20 m, and 25 m (5, 6, 8, and 11 June 2001; V-magnitude approximately 8.8; K-magnitude approximately -0.7).

From the derived JHK visibilities the size of CH Cyg was for the first time determined in 16 different spectral channels and the observations were compared with model predictions.