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|Title:||On the massive young stellar object AFGL 4176 High-spatial-resolution multi-wavelength observations and modeling|
|Authors:||Boley, P. A.|
Boekel, R. van
Sobolev, A. M.
|Citation:||On the massive young stellar object AFGL 4176 High-spatial-resolution multi-wavelength observations and modeling / P. A. Boley, H. Linz, R. van Boekel, J. Bouwman, T. Henning, A. M. Sobolev // Astronomy and Astrophysics. — 2012. — Vol. 547.|
|Abstract:||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. © 2012 ESO.|
STARS: INDIVIDUAL: AFGL 4176
TECHNIQUES: HIGH ANGULAR RESOLUTION
|Appears in Collections:||Научные публикации, проиндексированные в SCOPUS и WoS CC|
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|10.1051-0004-6361201218905.pdf||1,08 MB||Adobe PDF||View/Open|
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