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Paper: Mid-Infrared Long-Baseline Interferometry of the Symbiotic Mira Star RX Pup with the VLTI/MIDI Instrument
Volume: 378, Why Galaxies Care About AGB Stars: Their Importance as Actors and Probes
Page: 291
Authors: Driebe, T.; Hofmann, K.-H.; Ohnaka, K.; Schertl, D.; Weigelt, G.
Abstract: We present mid-infrared long-baseline interferometric observations of the symbiotic Mira star RX Pup obtained with the VLTI/midi instrument within the framework of the Science Demonstration Time (SDT) program in February 2004. Four visibility measurements have been carried out using the unit telescopes UT2 and UT3, with projected baseline lengths ranging from 34.7 to 46.5 m. All visibility measurements show a distinct wavelength dependence: a rather steep decrease between 8 and 10 μm, and a shallower monotonic increase longward of 10 μm. For the corresponding uniform disk diameter, this visibility shape translates into a diameter increase by a factor of 2 from 25 to 50 mas between 8 and 10 μm and an almost wavelength-independent diameter between 10 and 13 μm. As we show by means of radiative transfer modeling with the code dusty, this wavelength dependence measured with VLTI/midi can be interpreted as the mid-infrared signature of a circumstellar dust shell which is dominated by silicate dust.
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