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Observational constraints for C-rich AGB stars

par Rau, Gioia;Hron, Josef;Paladini, Claudia ;Aringer, Bernhard;Marigo, Paola;Eriksson, Kjell
Référence Memorie della Societa Astronomica Italiana, Supplementi - Journal of the Italian Astronomical Society, Supplement, 88, 3, page (455-458)
Publication Publié, 2017

Article révisé par les pairs

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Résumé :

We modeled the atmospheres of six carbon-rich Asymptotic Giant Branch stars (R Lep, R Vol, Y Pav, AQ Sgr, U Hya, and X TrA) using VLTI/MIDI interferometric observations, together with spectro-photometric data, we compared them with self-consistent, dynamic model atmospheres. The results show that the models can reproduce the Spectral Energy Distribution (SED) data well at wavelengths longer than 1 µm, and the interferometric observations between 8 µm and 10 µm. We found differences at wavelengths shorter than 1 µm in the SED, and longer than 10 µm in the visibilities. The discrepancies observed can be explained in terms of a combination of data- and model-related reasons. We derived some stellar parameters, and our findings agree well with literature values within the uncertainties. Also, when comparing the location of the stars in the H-R diagram, with evolutionary tracks, the results show that the main derived properties (L, T eff , C/O ratios and stellar masses) from the model fitting are in good agreement with TP-AGB evolutionary calculations.