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Modelling a set of C-rich AGB stars: The cases of RU Vir and R Lep

par Rau, Gioia;Paladini, Claudia ;Hron, Josef;Aringer, Bernhard;Groenewegen, Martin A. T.;Nowotny, Walter
Référence Memorie della Societa Astronomica Italiana, Supplementi - Journal of the Italian Astronomical Society, Supplement, 87, 2, page (260-264)
Publication Publié, 2016

Article révisé par les pairs

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Résumé :

We study the atmospheres of a set of carbon-rich asymptotic giant branch AGB stars to improve our understanding of the dynamic processes happening there. We compare in a systematic way spectrometric, photometric and mid-infrared (VLTI/MIDI) interferometric measurements with different types of model atmospheres: (1) hydrostatic models + MOD-dusty models added a posteriori; (2) self-consistent dynamic model atmospheres. These allow us to interpret in a coherent way the dynamic behavior of gas and dust. The results underline that the joint use of difierent kinds of observations, as photometry, spectroscopy and interferometry, is essential for understanding the atmospheres of pulsating C-rich AGB stars. For our first target, the carbon-rich Mira star RU Vir, the dynamic model atmospheres fit well the ISO/SWS spectrum in the wavelength range λ = [2:9; 13:0] μm. However, the object turned out to be somehow "peculiar". The other target we present is R Lep. Here the agreement between models and observations is much better although the MIDI data at 11:4 μm cannot be properly modelled.