Constraining convection across the AGB with high-angular-resolution observations
- Autor(en)
- Claudia Paladini, Fabien Baron, A. Jorissen, J.-B. Le Bouquin, B. Freytag, Sophie Van Eck, M. Wittkowski, J. Hron, A. Chiavassa, J.-P. Berger, C. Siopis, A. Mayer, G. Sadowski, K. Kravchenko, S. Shetye, F. Kerschbaum, J. Kluska, S. Ramstedt
- Abstrakt
We present very detailed images of the photosphere of an AGB star obtained with the PIONIER instrument, installed at the Very Large Telescope Interferometer (VLTI). The images show a well defined stellar disc populated by a few convective patterns. Thanks to the high precision of the observations we are able to derive the contrast and granulation horizontal scale of the convective pattern for the first time in a direct way. Such quantities are then compared with scaling relations between granule size, effective temperature, and surface gravity that are predicted by simulations of stellar surface convection.
- Organisation(en)
- Institut für Astrophysik
- Externe Organisation(en)
- European Southern Observatory (Chile), Georgia State University, Université Libre de Bruxelles, Université Grenoble-Alpes, University of Michigan, Uppsala University, European Southern Observatory (Germany), Université Nice-Sophia-Antipolis, Katholieke Universiteit Leuven
- Band
- 14
- Seiten
- 27-30
- Anzahl der Seiten
- 4
- DOI
- https://doi.org/10.1017/S1743921318007378
- Publikationsdatum
- 12-2019
- ÖFOS 2012
- 103003 Astronomie, 103004 Astrophysik
- Schlagwörter
- ASJC Scopus Sachgebiete
- Astronomy and Astrophysics, Space and Planetary Science
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/001aa86f-d30e-4e1f-9fe1-621772b75371