Numerical simulation of radiative transfer in circumstellar dust shells. II - Ellipsoidal shells

Details Numerical simulation of radiative transfer in circumstellar dust shells. II - Ellipsoidal shells Numerical simulation of radiative transfer in circumstellar dust shells. II - Ellipsoidal shells

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...121...51l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 121, no. 1, May 1983, p. 51-58.

Astronomy and Astrophysics

Astrophysics

37

Computerized Simulation, Cosmic Dust, Ellipsoids, Giant Stars, Radiative Heat Transfer, Stellar Envelopes, T Tauri Stars, Angular Momentum, Mie Scattering, Particle Size Distribution, Stellar Atmospheres, Stellar Models, Stellar Structure, Stellar Temperature, Wavelengths

Scientific paper

A numerical method is used to solve the radiative transfer problem. Multiple scattering, anisotropic phase functions and grain thermal emission are fully considered. The computation gives the distribution of dust temperatures versus (r, theta) spherical coordinates, the spectral distribution of the outward net flux, the bidimensional images of the source at selected wavelengths for various values of the foreshortening angle which specifies the observer's location. It is established that the isothermal surfaces are mostly spheres. Emergent spectra are obtained for typical shells appropriate for stars such as cool giants or T Tauri stars. Spectacular differences in image shapes are noted. The prominent parameters are found to be the wavelength, the foreshortening angle and the sensitivity of the used instrument.

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