This article has an erratum: [erratum]
Volume 547, November 2012
|Number of page(s)||14|
|Section||Interstellar and circumstellar matter|
|Published online||01 November 2012|
On the massive young stellar object AFGL 4176
High-spatial-resolution multi-wavelength observations and modeling
Max Planck Institute for Astronomy,
e-mail: firstname.lastname@example.org; email@example.com; firstname.lastname@example.org; email@example.com; firstname.lastname@example.org
2 Ural Federal University, Astronomical Observatory, 51 pr. Lenina, Ekaterinburg, Russia
Received: 30 January 2012
Accepted: 12 September 2012
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.
Key words: stars: formation / techniques: interferometric / techniques: high angular resolution / radiative transfer / stars: individual: AFGL 4176
© ESO, 2012
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