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| Title
| - Mid-infrared interferometric observations of four oxygen-rich Mira variables
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| Abstract
| - We present an investigation of the dust formation process in the atmospheres of the oxygen-rich AGB stars RR Aql, S Ori, GX Mon and R Cnc using spatially and spectrally resolved mid-infrared interferometric observations. We successfully compared multi epoch observations to a radiative transfer model of the dust shells, where the central stellar intensity profile is described by a series of dust-free dynamic model atmospheres based on self-excited pulsation models. We show that the Al 2O 3 shells have inner radii between 1.9 and 2.2 stellar photospheric radii, and that the silicate shells have inner radii between 4.1 and 4.6 stellar photospheric radii. The best-fit photospheric angular diameters are consistent with independent estimates. The model dust temperatures at the inner radii of 1.9-2.2 stellar radii and 4.1-4.6 stellar radii are consistent with dust condensation temperatures of Al 2O 3 and silicates, respectively.
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| - © EAS, EDP Sciences, 2013
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