(Re)Solving the dynamic atmospheres of carbon-rich giants
- Author(s)
- Josef Hron, Tijl Verhoelst, Walter Nowotny-Schipper, Susanne Höfner, Wolfgang Galsterer
- Abstract
Using hydrostatic and dynamic model atmospheres of pulsating red giants we present synthetic radii and visibilities for C-rich stars from the visual to the mid infrared. We investigate the wavelength regions most suitable for probing different regions of the extended atmospheres, i.e. from layers mostly affected by pulsation only out to regions where shock waves and dust formation are important. We also discuss the potential of simultaneous spectroscopy and interferometry for understanding the the complex dynamic atmospheres of AGB stars. From spectroscopic studies with ISO it has become clear that while there is rather good agreement between models and observations out to about 7œm, there is a remarkable discrepancy in the N-band in the sense that a very deep C2H2 absorption predicted by the models is basically never observed (Gautschy-Loidl et al., 2004). To clarify the reasons for this discrepancy we have recently obtained spectra and visibilities with MIDI at the VLT-I for two typical carbon stars. The results of these observations are presented and a first comparison with the predictions from different models is made. Œ 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- Katholieke Universiteit Leuven, Uppsala University, University of Vienna
- Journal
- Astronomische Nachrichten
- Volume
- 326
- Pages
- 562
- ISSN
- 0004-6337
- Publication date
- 2005
- Austrian Fields of Science 2012
- 103003 Astronomy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/f977180c-3a5d-4fdf-9329-4f700faa77cf