Results 291 to 300 of about 34,429 (304)

Radiative opacity due to the red system of CN

Journal of Quantitative Spectroscopy and Radiative Transfer, 1972
Abstract Recent observational and theoretical work has indicated that CN may play a major role in forming the spectrum and in fixing the thermal structure in a wide variety of cool stellar atmospheres. As the first step in investigating that role, we have calculated straight mean absorption coefficients over intervals of 100 cm -1 for the red system
Hollis R. Johnson, Irene R. Marenin, Stephan D. Price   +2 more
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Opacity measurements of a radiatively heated boron sample

Journal of Quantitative Spectroscopy and Radiative Transfer, 1997
Abstract A preliminary measurement of the opacity of a thin boron foil radiatively heated at moderate temperatures (5–20 eV) in conditions near local-thennodynamic-equilibrium (LTE) are reported. The opacity of a 0.37 μm thick boron sample has been measured in the K-shell range (40–60 A) using a 5000 l mm −1 transmission grating.
P. Renaudin, Franck Gilleron, Claude Chenais-Popovics, J.C. Gauthier, T. Miβalla, Hamed Merdji, J. Bruneau, S. Gary   +7 more
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Radiative transfer and opacity calculations

1964
The similarity groups for multicomponent, reacting gas mixtures with radiative energy transport are derived. The resulting relations are used to consider the feasibility of scaling for flow processes with radiative energy transport under highly simplified conditions.
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High-order multipole transitions in radiative opacities

Journal of Quantitative Spectroscopy and Radiative Transfer, 2006
Abstract The opacity code CASSANDRA, developed at AWE, has recently been modified to include all electric and magnetic multipole transitions of up to multipolarity L = 5 in both the bound–bound and bound–free spectra. It is found that the inclusion of these transitions increases the Rosseland mean opacity of moderate-Z elements by a few ...
B.J.B. Crowley, J.W.O. Harris, L.M. Upcraft   +2 more
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Calculation of the Radiative Opacity of a Hot Dense Plasma

Contributions to Plasma Physics, 1999
AbstractResults are presented for a theoretical model, known as the ion model (IM), recently elaborated to calculate the radiative opacity of a hot dense plasma. The model is based on the self‐consistent field method for subsystems obeying Gibbs statistics. The model is applied to compound chemical compositions.
openaire   +2 more sources

Radiative opacities and photosphere models for soft gamma repeaters

AIP Conference Proceedings, 1996
We consider the radiative processes for conditions expected in photospheres of neutron stars (NSs) with magnetic fields B∼1014–1016 G. The radiative opacities are employed to construct model photospheres and to calculate the spectral flux and specific intensity emitted by these objects which are thought to be associated with Soft Gamma Repeaters (SGRs).
V. G. Bezchastnov, George G. Pavlov, Yu. A. Shibanov, V. E. Zavlin   +3 more
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The radiative opacity at the Sun centre—a code comparison study

Journal of Quantitative Spectroscopy and Radiative Transfer, 2001
Abstract The results of a recent code comparison study are presented. In the study different codes were used to calculate the opacity of a plasma mixture whose composition, temperature and density were close to those believed to occur at the Sun's centre.
S. J. Rose, S. J. Rose
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The Atmospheres of AGB Stars: Opacities, Radiative Transfer and Models

EAS Publications Series, 2008
We discuss models of AGB star atmospheres. Special emphasis is put on the question of opacities, treatment of radiative transfer and simulation of interferometric results.
B. Aringer, Susanne Höfner, Walter Nowotny   +2 more
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Radiative opacity of high-temperature and high-density gold

Physical Review A, 1979
The authors calculate the radiative opacity of gold under conditions representing particle-beam--pellet fusion targets: solid density and a temperature of 750 eV. It is shown that under these conditions the absorption lines form broad bands due to the combined effects of linewidth, electrostatic splitting, and the existence of a distribution of ...
Z. Zinamon, E. Nardi
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Calculations of the radiative opacity of laser-produced plasmas

Journal of Physics B: Atomic, Molecular and Optical Physics, 1992
The author presents a model for the calculation of the radiative opacity of high-power laser-produced plasmas in local thermodynamic equilibrium (LTE). The model uses detailed configuration accounting in an open shell for both the line and photoelectric absorption.
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