Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...163..105h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 163, no. 1-2, July 1986, p. 105-113.
Astronomy and Astrophysics
Astrophysics
28
Atmospheric Scattering, Nonequilibrium Thermodynamics, Photosphere, Radiative Transfer, Supernovae, Numerical Stability, Optical Thickness, Stellar Envelopes, Stellar Models, Stellar Temperature
Scientific paper
The radiative transfer problem in the expanding layers of Type II supernovae is considered. The photosphere is characterized by very low densities and extensive scattering. Assuming a power law density gradient, the emerging flux is calculated for a spherical geometry and the validity of LTE assumption is investigated. It is found that as the radius of the envelope R increases and the density decreases, the deviations in the level occupation numbers from the LTE values at a given optical depth for absorption decrease for most wavelengths. However, as the radius of the photosphere continues to grow, the effect of scattering increases. It is discovered that for sufficiently large photospheric radii, backward scattering restores the Boltzmann distribution of level occupation numbers. The effects of NLTE on the continuum are investigated as a function of radius of the photosphere for fixed effective temperature and are found to be small.
Hoeflich Peter
Shaviv Giora
Wehrse Rainer
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