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| Paper: |
VLTI/MIDI Large Program: AGB Stars at Different Spatial Scales |
| Volume: |
497, Why Galaxies Care about AGB Stars III: A Closer Look in Space and Time |
| Page: |
97 |
| Authors: |
Paladini, C.; Klotz, D.; Wittkowski, M.; Hron, J.; Richichi, A.; Lagadec, E.; Verhoelst, T.; Rau, G.; Sacuto, S.; Jorissen, A.; Groenewegen, M. A. T.; Olofsson, H.; Kerschbaum, F. |
| Abstract: |
We have observed a sample of Asymptotic Giant Branch (AGB) stars from
the Herschel Mass-loss of Evolved StarS (MESS) program with the
VLTI MID-infrared Interferometric instrument (MIDI). The program aims
at providing insight to the atmospheres of those stars, to be able to
understand the role of the mass-loss process at different spatial
scales. We obtained visibilities and spectra of fourteen objects with
different chemistries and variability classes. These observations,
together with data we retrieved from the archive, allow us to
characterize not only the geometry of the dust-forming region, but in
some cases also the time variability in the N band. As previously
reported in the literature, we confirm the detection of spectroscopic
but not interferometric variability. This result has implications on
the size of the structures involved in the dust-formation process.
We also report two cases of asymmetric structures; the nature of these
structures will be clearly identified only with the second generation
VLTI instrument MATISSE. |
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