EPoS Contribution
EPoS Contribution
Under the Influence: Multi-wavelength Modelling of Three Embedded and Ionizing Massive Stars

Katharine Johnston
Harvard-Smithsonian Center for Astrophysics, Cambridge, USA
To uncover a complete picture of how massive stars form while under the influence of their ionizing radiation, we have modelled the circumstellar material of three massive YSOs using a multi-wavelength approach. Firstly, I will show that via a "genetic" search algorithm we are able to closely model the infrared to sub-mm SEDs and images of the three embedded stars in question, IRAS 20126+4104, AFGL 2591 and Mol12, giving a handle on the inclination of these systems, the accretion through the envelope and disk, and the properties of the central star. Secondly, I will present results from modelling mm molecular line and continuum observations which trace the disks, outflows, and dust cores of these YSOs. Finally, I will present a model for the morphology of the ionized gas we observe toward these three objects in cm continuum, based on the model presented in Keto and Wood (2006), and will give predictions for what these UC HII regions will look like in radio recombination lines with ALMA.
Caption: Best simultaneous fit to the SED and infrared images of IRAS 20126+4104. Top: best fit model (long dashed line) to the observed SED. Bottom left: observed IRAC three-colour image of IRAS 20126+4104. Bottom right: corresponding IRAC image of the best fit model.
Collaborators:
E. Keto, CfA, USA
D. Shepherd, NRAO, USA/South Africa
K. Wood, U of St Andrews, UK
A. Remijan, NRAO, USA
D. Poelman
Key publication

Suggested Session: Early Phases of Disks, Massive Stars