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Comment: 12 pages, 10 figures, Accepted for publication in MNRAS. 32 pages in arXiv
Context: Geometrically thin, detached shells of gas have been found around a handful of carbon stars. Aims: Previous observations of scattered stellar light in the circumstellar medium around the carbon star U Ant were taken through filters centred on the resonance lines of K and Na. These observations could not separate the scattering by dust and atoms. The aim of this paper is to remedy this situation. Methods: We have obtained polarization data on stellar light scattered in the circumstellar medium around U Ant through filters which contain no strong lines, making it possible to differentiate between the two scattering agents. Kinematic, as well as spatial, information on the gas shells were obtained through high-resolution echelle spectrograph observations of the KI and NaD lines. Results: We confirm the existence of two detached...
Comment: 3 pages, 1 figure. To appear in the Proceedings of "Stellar Clusters and Associations - a RIA workshop on Gaia", 23rd-27th May 2011, Granada, Spain
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