High-resolution thermal IR imaging of MWC300 with VLT/VISIR

Details High-resolution thermal IR imaging of MWC300 with VLT/VISIR High-resolution thermal IR imaging of MWC300 with VLT/VISIR

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sf2a.conf..455d&link_type=abstract

"SF2A-2008: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: C. Charbonnel, F. Combes

Astronomy and Astrophysics

Astrophysics

Scientific paper

{B[e] stars are expected to possess dusty circumstellar environments, which are responsible for a strong infrared (IR) excess.} % Aims {Using single-dish diffraction-limited imaging in the thermal infrared domain, we aim at measuring the angular extension of the dusty environment of the galactic B[e] MWC 300.} % Methods {We obtained diffraction-limited images of MWC 300 at 11.25 μm using the BURST mode of the VLT/VISIR instrument.} % Results {MWC 300 is partially, but statistically significantly, resolved by VISIR so that we could measure the size of its dusty envelope for the first time. By assuming a 2D circular Gaussian intensity distribution and using different image analysis methods we measured a FWHM angular size of 69±10 mas. For a distance of 1.8 kpc, we obtain a linear size of 125±18 {AU}=(1.87±0.26)×10^{13} m for the circumstellar dust emitting in the mid-IR. This measured size is shown to agree with a model that was calculated with a Monte Carlo radiative transfer code for dust envelopes. The flux of MWC 300 at 11.25 μm is estimated as 84.5±1.4 Jy = (20.0±0.3)×10^{-13} W/m^2/μm. } % Conclusions {The VLT/VISIR now offers the possibility of obtaining mid-IR diffraction-limited images with a high signal-to-noise ratio. The MWC 300's size as directly measured in this work is compatible with the theoretical size of a nearly edge-on dusty disc estimated in previous works. Interferometric data at milliarcsec angular resolution are required to reveal details on this dusty envelope.}

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