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Paper: A Multi-technique Study of the Circumstellar Disk of α Arae
Volume: 506, Bright Emissaries: Be Stars as Messengers of Star-Disk Physics
Page: 283
Authors: Mota, B. C.; Carciofi, A. C.; Bednarski, D.; Rivinius, T.
Abstract: Classical Be stars are the only Main Sequence stars that possess Keplerian decretion circumstellar disks ruled by viscous processes. The physical properties of the disk can be studied by modeling its structure and solving the radiative transfer problem. In this point, the production of synthetic observables arises as a tool to investigate the physical quantities of the system. Among the proposed models to the disk formation, the Viscous Decretion Disk model is the current paradigm, correctly describing a large set of evidences that implies viscous shear is the mechanism driving the disk outflow. In this work we present an analysis of the circumstellar disk of one of the most observed Be stars, α Arae, based on the Viscous Decretion Disk paradigm. Our main objective is to demonstrate a circumstellar disk is sufficient to explain all the available observations, and to derive what are the physical properties of this disk. Our preliminary results suggest a disk with a moderate density (1.0×10–13 cm–3) viewed at 45 deg. Furthermore, the modeling of SED, in particular in the UV domain, allowed us to revisit some of the stellar parameters listed in the literature.
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