10-micron interferometry of the disk and wind of the massive young star MWC349 A

Simon Albrecht; Andreas Quirrenbach; Robert N. Tubbs

doi:10.1117/12.670314

26 June 2006 10-micron interferometry of the disk and wind of the massive young star MWC349 A

Simon Albrecht, Andreas Quirrenbach, Robert N. Tubbs

Proceedings Volume 6268, Advances in Stellar Interferometry; 62681E (2006) https://doi.org/10.1117/12.670314
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

Abstract

We present VLTI-MIDI (the Mid-Infrared Interferometric Instrument at ESO's Very Large Telescope Interferometer) observations of MWC349 A, which are a prime example of the power of combined spatial and spectral resolution for addressing complex astrophysical phenomena. Previous observations of the peculiar emission line star MWC349A suggest that it is a young massive star in the short-lived phase of already having dissipated its parent cloud, but still being surrounded by the accretion disk, which is seen nearly edge-on. It is believed that the unique hydrogen recombination line maser / laser activity of MWC349A from mm to infrared wavelengths is also a consequence of this viewing geometry. We have taken 13 measurements with MIDI at the VLTI (Very Large Telescope Interferometer) in the GRISM mode covering the N band (8 to 13 microns) at a spectral resolution R ≈ 230. The wavelength dependence of the continuum visibility agrees with model calculations for circumstellar dust disks. In addition, the signatures of at least a dozen emission lines have been identified in the interferometric data. We present a first analysis of visibility amplitudes and differential phase data. In particular we show that a simple model can represent the SED and visibility amplitude of the continuum flux. Also the visibilities for the hydrogen and forbidden lines are discussed.

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Simon Albrecht, Andreas Quirrenbach, and Robert N. Tubbs "10-micron interferometry of the disk and wind of the massive young star MWC349 A", Proc. SPIE 6268, Advances in Stellar Interferometry, 62681E (26 June 2006); https://doi.org/10.1117/12.670314

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KEYWORDS

Visibility

Stars

Hydrogen

Surface conduction electron emitter displays

Interferometry

Interferometers

Neon

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