Astronomy and Astrophysics, volume 547A, 88-88 (2012/11-1)
On the massive young stellar object AFGL 4176. High-spatial-resolution multi-wavelength observations and modeling.
BOLEY P.A., LINZ H., VAN BOEKEL R., BOUWMAN J., HENNING T. and SOBOLEV A.M.
Abstract (from CDS):
Deeply embedded and at distances of several kiloparsecs, massive young stellar objects (MYSOs) present numerous challenges for observation and study. In this work, we present spatially-resolved observations of one MYSO, AFGL 4176, together with survey and literature data, ranging from interferometric observations with VLTI/MIDI in the mid-infrared, to single-dish Herschel measurements in the far-infrared, and sub-millimeter data from APEX. We consider this spatially-resolved, multi-wavelength data set in terms of both radiative transfer and geometric models. We find that the observations are well described by one-dimensional models overall, but there are also substantial deviations from spherical symmetry at scales of tens to hundreds of astronomical units, which are revealed by the mid-infrared interferometric measurements. We use a multiple-component, geometric modeling approach to explain the mid-infrared emission on scales of tens to hundreds of astronomical units, and find the MIDI measurements are well described by a model consisting of a one-dimensional Gaussian halo and an inclined (θ=60°) circumstellar disk extending out to several hundred astronomical units along a position angle of 160°. Finally, we compare our results both with previous models of this source, and with those of other MYSOs, and discuss the present situation with mid-infrared interferometric observations of massive stars.
stars: formation - techniques: interferometric - techniques: high angular resolution - radiative transfer - stars: individual: AFGL 4176
+ corrigendum vol. 557, p. C1 (2013)
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