VLTI/MIDI Large Program: AGB Stars at Different Spatial Scales
- Author(s)
- C. Paladini, D. Klotz, M. Wittkowski, J. Hron, A. Richichi, E. Lagadec, T. Verhoelst, G. Rau, S. Sacuto, A. Jorissen, M. A. T. Groenewegen, H. Olofsson, F. Kerschbaum
- 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 tounderstand 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 insome 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.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- Université Libre de Bruxelles, European Southern Observatory (Germany)
- Pages
- 97
- Publication date
- 08-2015
- Austrian Fields of Science 2012
- 103004 Astrophysics, 103003 Astronomy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/7d7ca8ae-f6d6-44b2-b3a6-faa21a79e108