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An Improved Model of SiO Maser Emission in Miras
M. D. Gray, M. Wittkowski, M. Scholz +3
We describe a combined dynamic atmosphere and maser propagation model of SiO maser emission in Mira variables. This model rectifies many of the defects of an earlier model of this…
Asymmetric silicate dust distribution toward the silicate carbon star BM Gem
Keiichi Ohnaka, Hideyuki Izumiura, Christoph Leinert +3
Silicate carbon stars show the 10 micron silicate emission, despite their carbon-rich photospheres. They are considered to have circumbinary or circum-companion disks, which serve…
Spatially resolved dusty torus toward the red supergiant WOH G64 in the Large Magellanic Cloud
Keiichi Ohnaka, Thomas Driebe, Karl-Heinz Hofmann +2
We present N-band spectro-interferometric observations of the red supergiant WOH G64 in the Large Magellanic Cloud (LMC) using MIDI at the Very Large Telescope Interferometer (VLTI…
The close circumstellar environment of the semi-regular S-type star Pi^1 Gruis
Stéphane Sacuto, Alain Jorissen, Pierre Cruzalèbes +4
We study the close circumstellar environment of the nearby S-type star Pi^1 Gruis using high spatial-resolution, mid-infrared observations from the ESO/VLTI. Spectra and visibiliti…
Resolving the inner active accretion disk around the Herbig Be star MWC 147 with VLTI/MIDI+AMBER spectro-interferometry
Stefan Kraus, Thomas Preibisch, Keiichi Ohnaka
We studied the geometry of the inner (AU-scale) circumstellar environment around the Herbig Be star MWC 147. Combining, for the first time, near- (NIR, K band) and mid-infrared (MI…
J, H, K spectro-interferometry of the Mira variable S Orionis
M. Wittkowski, D. A. Boboltz, T. Driebe +4
Aims: We present J, H, K interferometry with a spectral resolution of 35 for the Mira variable S Orionis. We aim at measuring the diameter variation as a function of wavelength tha…