Mid-infrared view of cool evolved stars with the Very Large Telescope interferometer
Ohnaka, K., Driebe, T., Hofmann, K.-H., Weigelt, G., Wittkowski, M.
Proceedings of the SPIE conference "Astronomical Instrumentation"
held in Marseille, France from June 23-28, 2008
SPIE Proceedings, Volume 7013, pg.70134M (1-6) (2008)
Abstract
Two interferometric instruments at ESO’s Very Large Telescope Interferometer (VLTI)—MIDI and AMBER
operating in the mid-infrared (8–13 μm) and the near-infrared (JHK), respectively — have proven to be
very powerful to study the physical properties of the circumstellar material around evolved stars. With the
“spectro-interferometric” capability of MIDI and AMBER, we can disentangle spectral and spatial information
on the observed object. VLTI observations have confirmed our pictures on the circumstellar environment
of cool evolved stars in some cases but brought about entirely unexpected pictures in other cases. Here, we
present our recent results obtained with VLTI/MIDI.
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