28 research outputs found

    Radio and IR interferometry of SiO maser stars

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    Radio and infrared interferometry of SiO maser stars provide complementary information on the atmosphere and circumstellar environment at comparable spatial resolution. Here, we present the latest results on the atmospheric structure and the dust condensation region of AGB stars based on our recent infrared spectro-interferometric observations, which represent the environment of SiO masers. We discuss, as an example, new results from simultaneous VLTI and VLBA observations of the Mira variable AGB star R Cnc, including VLTI near- and mid-infrared interferometry, as well as VLBA observations of the SiO maser emission toward this source. We present preliminary results from a monitoring campaign of high-frequency SiO maser emission toward evolved stars obtained with the APEX telescope, which also serves as a precursor of ALMA images of the SiO emitting region. We speculate that large-scale long-period chaotic motion in the extended molecular atmosphere may be the physical reason for observed deviations from point symmetry of atmospheric molecular layers, and for the observed erratic variability of high-frequency SiO maser emissionComment: 8 pages, 4 figures, submitted to Proc. IAU Symp. 287 "Cosmic masers - from OH to H_0", R.S. Booth, E.M.L. Humphreys, W.H.T. Vlemmings (eds.), invited pape

    Vertrauen und Beten : Überlegungen zum Zusammenhang zwischen zwei Vollzügen christlichen Lebens

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    Detalle Exterior Estructura De Cubiert

    Vertrauen und Beten : Überlegungen zum Zusammenhang zwischen zwei Vollzügen christlichen Lebens

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    Angst?

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    Beyond deficit or perfection : enhancing finite life

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    Gottes Gegenwart und die ‚Zeit der Gemeinde‘: Eine Problemskizze im Gespräch mit Karl Barth

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