Programme

O.1 -- Oral, IWTCP-2

Date: Tuesday, 29-07-2014

Time: 09h40 - 10h00

Radiative transfer modeling and its applications in probing the physical conditions of stellar environments

Dinh Van Trung

Institute of Physics, Vietnam Academy of Science and Technology

Our understanding of the stellar environment mainly comes from interpretation of imaging and spectroscopic observations of these objects. To infer the physical conditions it is necessary to model in detail the excitation processes involved in the formation of atomic or molecular spectral lines together with the influences of the dynamics of the environment such as large scale linear motion or rotation. In this contribution I will focus on the molecular excitation processes and the techniques and sophisticated tools used to simulate the formation and transfer of spectral lines in stellar environment. The development of these radiative transfer techniques and tools by our group is also highlighted. Comparison between simulations and observational data allows to extract the information on the physical conditions of the environment. I will also present our study of several typical stellar and circumstellar objects ranging from the envelopes around intermediate mass stars such as CW Leo to supergiant stars such as VY CMa to illustrate the important interplay between observations and theoretical modeling in understating these objects.

Presenter: Dinh Van Trung