High-Resolution Near-Infrared Speckle
Interferometry and Radiative Transfer Modeling of the OH/IR Star OH
26.5+0.6
Driebe, T.; Riechers, D.; Balega, Y.Y.;
Hofmann, K.-H.; Menshchikov, A.B.; Weigelt, G.
"Why Galaxies Care About AGB Stars: Their
Importance as Actors and Probes"
ASP Conference Series held from August 7-11, 2006 in Vienna, Austria
Vol. 378, pg.289-290(2007)
Abstract
We present near-infrared speckle interferometry of the OH/IR star OH
26.5+0.6 in the K′ band obtained with the 6-m telescope of the Special
Astrophysical Observatory (SAO) in October 2003. At λ = 2.12 μm the
diffraction-limited resolution of 74 mas was attained. The
reconstructed visibility function shows that the stellar contribution
to the total flux at λ = 2.12 μm is less than 50%, indicating a rather
large optical depth of the circumstellar dust shell (CDS) surrounding
this highly reddened object, in accordance with the strong silicate
absorption feature seen in the spectral energy distribution (SED). Our
phase-dependent modeling approach follows a strategy similar to the one
recently applied successfully to interpret observations of the OH/IR
star OH 104.9+2.4 (Riechers et al. 2005). From our analysis, we derived
several physical parameters of the central star and the CDS as a
function of pulsation phase.
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