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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 421698.0, MPI für Astronomie / Publikationen_mpia
High-Resolution Near-Infrared Speckle Interferometry and Radiative Transfer Modeling of the OH/IR Star OH 26.5+0.6
Authors:Driebe, T.; Riechers, D.; Balega, Y. Y.; Hofmann, K. H.; Men'shchikov, A. B.; Weigelt, G.
Date of Publication (YYYY-MM-DD):2008
Title of Proceedings:The Power of Optical/IR Interferometry: Recent Scientific Results and 2nd Generation Instrumentation
Start Page:509
End Page:510
Name of Conference/Meeting:The Power of Optical/IR Interferometry: Recent Scientific Results and 2nd Generation
Review Status:not specified
Audience:Experts Only
Abstract / Description:We present near-infrared speckle interferometry of the OH/IR star OH 26.5+0.6 in the K' band obtained with the 6m telescope of the Special Astrophysical Observatory (SAO) in Oct. 2003. At a wavelength of lambda = 2.13 mum the diffraction-limited resolution of 74 mas was attained. The reconstructed visibility reveals a spherically symmetric, circumstellar dust shell (CDS) surrounding the central star. In accordance with the deep silicate absorption feature in the spectral energy distribution (SED), the drop of the visibility function to a value of 0.36 at the cutoff frequency indicates a rather large optical depth of the CDS. To determine the structure and the properties of the CDS of OH 26.5+0.6, radiative transfer calculations using the code DUSTY[3] were performed to simultaneously model its visibility and the SED. Since OH 26.5+0.6 is highly variable, the observational data taken into consideration for the modeling correspond to different phases of the object's variability cycle. As in the case of another OH/IR star, OH 104.9+2.4 (see [5] and Riechers et al., this volume), we used these observational constraints at different epochs to derive several physical parameters of the central star and the CDS of OH 26.5+0.6 as a function of phase
Comment of the Author/Creator:Date: 2008, n/a 1, 2008
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISBN:978-3-540-74253-1 [ID No:1]
URL:http://adsabs.harvard.edu/abs/2008poii.conf..509D [ID No:2]
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