The Dynamic Atmospheres Of Carbon Rich Giants: Constraining Models Via Interferometry

Author(s)

Gioia Rau, Josef Hron, Claudia Paladini, Bernard Aringer, Kjell Eriksson, Paola Marigo

Abstract

Dynamic models for the atmospheres of C-rich Asymptotic Giant Branch

stars are quite advanced and have been overall successful in reproducing

spectroscopic and photometric observations. Interferometry provides

independent information and is thus an important technique to study the

atmospheric stratification and to further constrain the dynamic models.

We observed a sample of six C-rich AGBs with the mid infrared

interferometer VLTI/MIDI. These observations, combined with photometric

and spectroscopic data from the literature, are compared with synthetic

observables derived from dynamic model atmospheres (DMA, Eriksson et al.

2014). The SEDs can be reasonably well modelled and the interferometry

supports the extended and multi-component structure of the atmospheres,

but some differences remain. We discuss the possible reasons for these

differences and we compare the stellar parameters derived from this

comparison with stellar evolution models. Finally, we point out the high

potential of MATISSE, the second generation VLTI instrument allowing

interferometric imaging in the L, M, and N bands, for further progress

in this field.

Organisation(s)

Department of Astrophysics

External organisation(s)

Université Libre de Bruxelles, Osservatorio Astronomico, Uppsala University

Pages

111

DOI

https://doi.org/10.5281/zenodo.59012

Publication date

07-2016

Austrian Fields of Science 2012

103004 Astrophysics

Keywords

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