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| Paper: |
Circumstellar Envelopes of OH/IR Stars |
| Volume: |
445, Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants |
| Page: |
369 |
| Authors: |
Ruiz-Velasco, A. E.; Wittkowski, M.; Driebe, T.; Wachter, A.; Höfner, S. |
| Abstract: |
We present VLTI observations of the tip-AGB star IRAS 17020–5254
carried out with the AMBER and MIDI instruments
using the 1.8-m Auxiliary Telescopes (ATs) with three different
baselines. This star is an evolved oxygen-rich single star of the
OH/IR type. We fit the resulting near-infrared visibilities with a
model consisting of a Gaussian component plus a central uniform disk,
obtaining apparent diameters of the dust shell, the central star,
and their flux ratios. We also show the uniform disk diameter as a
function of wavelength from both the AMBER and MIDI
observations. The mid-infrared diameter is about two to three times
larger than the near-infrared one. We plan to compare these data to
hydrodynamic atmosphere and wind models. |
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