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VLTI/MIDI Large Program: AGB Stars at Different Spatial Scales

Paladini, C. (author)
Klotz, D. (author)
Wittkowski, M. (author)
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Hron, J. (author)
Richichi, A. (author)
Lagadec, E. (author)
Verhoelst, T. (author)
Rau, G. (author)
Sacuto, S. (author)
Jorissen, A. (author)
Groenewegen, M. A. T. (author)
Olofsson, Hans, 1952 (author)
Chalmers tekniska högskola,Chalmers University of Technology
Kerschbaum, F. (author)
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 (creator_code:org_t)
ISBN 9781583818794
2015
2015
English.
In: Conference on Why Galaxies Care About AGB Stars III: A Closer Look in Space and Time, Vienna, Austria, JUL 28-AUG 01, 2014. - 9781583818794 ; 497, s. 97-102
  • Conference paper (peer-reviewed)
Abstract Subject headings
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  • 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.

Subject headings

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

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