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Proceedings Paper

Computer simulations of interferometric imaging with the VLT Interferometer and the AMBER instrument
Author(s): Thomas Bloecker; Karl-Heinz Hofmann; Frank Przygodda; Gerd Weigelt
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Paper Abstract

We present computer simulations of interferometric imaging with the VLT interferometer and the AMBER instrument. These simulations include both the astrophysical modeling of a stellar object by radiative transfer calculations and the simulation of light propagation from the object to the detector (through atmosphere, telescopes, and the AMBER instrument), simulation of photon noise and detector read- out noise, and finally data processing of the interferograms. The results show the dependence of the visibility error bars on the following observational parameters: different seeing during the observation of object and reference star (Fried parameters r0,object equals 2.4 m, r0,ref. equals 2.5 m), different residual tip- tilt error ((delta) tt,object equals 2% of the Airy disk diameter, (delta) tt,ref. equals 0.1%), and object brightness (Kobject equals 3.5 mag and 11 mag, Kref. equals 3.5 mag). Exemplarily, we focus on stars in late stages of stellar evolution and study one of its key objects, the dusty supergiant IRC + 10420 that is rapidly evolving on human timescales. We show computer simulations of VLTI interferometry of IRC + 10420 with two ATs (wide-field mode, i.e. without fiber optics spatial filters) and discuss whether the visibility accuracy is sufficient to distinguish between different theoretical model predictions.

Paper Details

Date Published: 5 July 2000
PDF: 10 pages
Proc. SPIE 4006, Interferometry in Optical Astronomy, (5 July 2000); doi: 10.1117/12.390205
Show Author Affiliations
Thomas Bloecker, Max-Planck-Institut fuer Radioastronomie (Germany)
Karl-Heinz Hofmann, Max-Planck-Institut fuer Radioastronomie (Germany)
Frank Przygodda, Max-Planck-Institut fuer Radioastronomie (Germany)
Gerd Weigelt, Max-Planck-Institut fuer Radioastronomie (Germany)

Published in SPIE Proceedings Vol. 4006:
Interferometry in Optical Astronomy
Pierre J. Lena; Andreas Quirrenbach, Editor(s)

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