Mid-Infrared Long-Baseline Interferometry of
the Symbiotic Mira Star RX Pup with the VLTI/MIDI Instrument
Driebe, T.; Hofmann, K.-H.; Ohnaka, K.;
Schertl, D.; Weigelt, G.
"Why Galaxies Care About AGB Stars: Their
Importance as Actors and Probes"
ASP Conference Series held from August 7-11, 2006 in Vienna, Austria
Vol. 378, pg.291-292(2007)
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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