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Proceedings Paper

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

Paper Details

Date Published: 26 June 2006
PDF: 10 pages
Proc. SPIE 6268, Advances in Stellar Interferometry, 62681E (26 June 2006); doi: 10.1117/12.670314
Show Author Affiliations
Simon Albrecht, Leiden Observatory (Netherlands)
Andreas Quirrenbach, Landessternwarte Königstuhl (Germany)
Robert N. Tubbs, Osservatorio Astrofisico di Arcetri (Italy)

Published in SPIE Proceedings Vol. 6268:
Advances in Stellar Interferometry
John D. Monnier; Markus Schöller; William C. Danchi, Editor(s)

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