Publications
of the
MPIfR Optical & Infrared Interferometry Group

D. Riechers, M. Berger, Y. Balega, T. Driebe, K.-H. Hofmann, G. Weigelt

High-resolution near-infrared speckle interferometry and radiative transfer modeling of the OH/IR star OH104.9+2.4

In: Schielikke, R.E. (ed.): Short Contrib. Ann. Sci. Meeting Astron. Ges. Freiburg 2003. Astron. Nachr. 324, Suppl. Issue 3 (2003), p.136
The Sun and Planetary Systems - Paradigms for the Universe
Annual Scientific Meeting of the Astronomische Gesellschaft, Sep 15-20, 2003, Freiburg, Germany

Abstract

Results of near-infrared speckle interferometry of the OH/IR star OH104.9+2.4 obtained with the SAO 6 m telescope are presented. The diffraction-limited K'-band observations with a resolution of 74 mas show that the object is surrounded by a dust shell that totally obscures the central star. No evidence for a major deviation from a spherically symmetric geometry is found. The Gaussian FWHM diameter is determined to be 47 pm 3 mas. For a more detailed analysis of the circumstellar dust shell, we used the 1-D radiative transfer code DUSTY developed by Ivezi and Elitzur (1999). The DUSTY code allows us to simultaneously model the observed visibility and the spectral energy distribution (SED) of the object OH104.9+2.4 and to derive various physical parameters, such as the inner radius of the dust shell, the density and temperature profiles, general optical properties as well as the chemical composition and grain sizes of the dust.