SIMBAD references

2005MNRAS.363..615S - Mon. Not. R. Astron. Soc., 363, 615-627 (2005/October-3)

Two-dimensional Monte Carlo simulations of HI line formation in massive young stellar object disc winds.


Abstract (from CDS):

Massive young stellar objects (YSOs) are powerful infrared Hi line emitters. It has been suggested that these lines form in an outflow from a disc surrounding the YSO. Here, new two-dimensional Monte Carlo radiative transfer calculations are described which test this hypothesis. Infrared spectra are synthesized for a YSO disc wind model based on earlier hydrodynamical calculations. The model spectra are in qualitative agreement with the observed spectra from massive YSOs, and therefore provide support for a disc wind explanation for the Hi lines. However, there are some significant differences: the models tend to overpredict the Brα/Brγ ratio of equivalent widths and produce line profiles which are slightly too broad and, in contrast to typical observations, are double-peaked. The interpretation of these differences within the context of the disc wind picture and suggestions for their resolution via modifications to the assumed disc and outflow structure are discussed.

Abstract Copyright: 2005 RAS

Journal keyword(s): radiative transfer - methods: numerical - stars: early-type - stars: winds, outflows

CDS comments: GL989 = RAFGL 989.

Simbad objects: 3

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