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Post Info TOPIC: RAFGL 4176


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Posts: 131433
Date:
AFGL 4176
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Title: On the massive young stellar object AFGL4176: High-spatial-resolution multi-wavelength observations and modelling
Authors: Paul Boley, Hendrik Linz, Roy van Boekel, Jeroen Bouwman, Thomas Henning, Andrey Sobolev

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-millimetre 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 modelling 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 (\theta=60 deg) circumstellar disk extending out to several hundred astronomical units along a position angle of 160 deg. 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.

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L

Posts: 131433
Date:
RAFGL 4176
Permalink  
 


Title: Observations and modelling of the massive young star AFGL 4176: From large scales to small
Authors: Paul Boley, Roy van Boekel, Hendrik Linz, Jeroen Bouwman, Andrey Sobolev, Thomas Henning

We present spatially-resolved mid-infrared interferometric observations of the massive young stellar object AFGL 4176, together with literature and survey data. We model these observations using a simple, spherically-symmetric radiative transfer model, and find that the observational data are consistent with a highly luminous star surrounded by a thick envelope.

Read more (1646kb, PDF)

Position (J2000): R.A. 13 43 02.1  |  Dec. -62° 08' 52''



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