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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 693660.0, MPI für Astronomie / Publikationen_mpia
Mid-infrared interferometric observations of four oxygen-rich Mira variables
Authors:Karovicova, I.; Wittkowski, M.; Ohnaka, K.; Boboltz, D. A.; Fossat, E.; Scholz, M.
Publisher:EDP Sciences
Date of Publication (YYYY-MM-DD):2013
Title of Proceedings:New Advances in Stellar Physics
Start Page:191
End Page:196
Volume (in Series):63
Name of Conference/Meeting:EAS Publications Series
Audience:Not Specified
Abstract / Description: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 Al2O3 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 Al2O3 and silicates, respectively.
Comment of the Author/Creator:Date: 2013, December 1, 2013
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
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