Asymmetries start in the AGB phase
- Author(s)
- F. Lykou, D. Klotz, J. Hron, C. Paladini, A. Jorissen, O. Chesneau, Eric Lagadec, Albert A. Zijlstra, Peter G. Tuthill, Barnaby R. M. Norris, J. Monnier, J. Kluska, Sofia Ramstedt, M. Wittkowski, Matthias Maercker
- Abstract
It has been argued for many years now, that asymmetries found in thepost-AGB stars and planetary nebulae should originate as early as duringthe AGB phase. We present results of our high-angular resolutionobserving programs with the VLT and VLTI, which allowed us to detect asymmetries in the form of disk-like structures in two AGB stars, one C-rich and one O-rich. Both stars exhibit also dimming events, when their visual and infrared magnitudes vary significantly and at periodsmuch large than the typical Mira values. I will argue on the importanceof these characteristics as indicators of binarity and explain howstudying such objects, which are probably in transition to the post-AGBphase, can send more light in ejecta shaping agents.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- Université Côte d'Azur, University of Manchester, The University of Sydney, University of Michigan, Universite Stendhal Grenoble III, Uppsala University, Max-Planck-Institut für Radioastronomie, Université Libre de Bruxelles, European Southern Observatory (Germany)
- Publication date
- 04-2014
- Austrian Fields of Science 2012
- 103004 Astrophysics
- Keywords
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/a0e2aeae-55c7-4cfb-9c8d-9d0036e25ff7