Results 11 to 20 of about 34,429 (304)
Helioseismic Tests of Radiative Opacities. [PDF]
AIP Conference Proceedings, 2002 During the past fifteen years, thousands of solar acoustic oscillation modes have been measured to remarkable precision, in many cases to within 0.01%. These frequencies have been used to infer the interior structure of the sun and test the physical input to solar models. Here we summarize the procedures, input physics and assumptions for calculating a
J. A. Guzik +4 more
+6 more sources
On radiative opacities of dense plasmas
Physica B: Condensed Matter, 1996 Abstract Besides advanced atomic data, the strong coupling effects are the key-stones for true radiative opacities and for the proper description of energy transport in dense matter. These opacities, which are sensitive to the ‘windows’ in absorption spectra, are discussed briefly in terms of strongly coupled plasmas (SCP) dielectric functions.
Yu. K. Kurilenkov +4 more
openalex +3 more sources
Opacities for the solar radiative interior
The Astrophysical Journal, 1991 Opacities for the solar radiative interior are computed and compared to previous calculations. A significant enhancement of the Rosseland mean opacity near the bottom of the convection zone is reported when compared to the Los Alamos Astrophysical Opacity Library. The discrepancy is attributed mainly to the equation of state.
Carlos A. Iglesias, F. J. Rogers
openalex +3 more sources
Effects of opacity temperature dependence on radiatively accelerated clouds [PDF]
Monthly Notices of the Royal Astronomical Society, 2020 ABSTRACT We study how different opacity–temperature scalings affect the dynamical evolution of irradiated gas clouds using time-dependent radiation-hydrodynamics simulations. When clouds are optically thick, the bright side heats up and expands, accelerating the cloud via the rocket effect. Clouds that become more optically thick as they
Sergei Dyda +2 more
openalex +3 more sources
Radiative Transfer with Opacity Distribution Functions: Application to Narrowband Filters [PDF]
The Astrophysical Journal Supplement Series, 2021 Abstract Modeling of stellar radiative intensities in various spectral passbands plays an important role in stellar physics. At the same time, direct calculation of the high-resolution spectrum and then integration of it over the given spectral passband is computationally demanding due to the vast number of atomic and molecular lines ...
L. S. Anusha +5 more
openalex +7 more sources
Opacity Sampling in Radiative Acceleration Calculations [PDF]
The Astrophysical Journal, 2000 The accuracy requirements on atomic data for the calculation of stellar evolution with atomic diffusion are determined. In particular, the density of frequency grids needed for precise radiative acceleration (grad) calculations via the sampling method are presented.
F. Leblanc, G. Michaud, J. Richer
openalex +4 more sources
Updated Opacity Project radiative accelerations [PDF]
Monthly Notices of the Royal Astronomical Society, 2007 Updated data for the calculation of radiative accelerations, grad, referred to as OP 2005, have been made generally available on the Web. They differ from the earlier 1997 OP data mainly in the inclusion of contributions from inner-shell processes. The frequency resolution used for OP 2005 is shown to be satisfactory except for extreme cases of low ...
M. J. Seaton
openalex +3 more sources
A note on the contribution of multi-photon processes to radiative opacity [PDF]
High Energy Density Physics, 2017 Recently, Bailey et al. performed iron opacity measurements on the Z machine at Sandia National Laboratory in conditions close to the ones of the base of the convective zone of the Sun. Such experiments have raised questions about the physical models commonly used in opacity codes. To understand the discrepancy between experiment and theory, More et al.
Jean‐Christophe Pain
openalex +6 more sources
Radiative opacity of stellar matter.
The Astronomical Journal, 1953 H. Zirin
openalex +4 more sources
Opacity determination in the solar radiative interior [PDF]
Monthly Notices of the Royal Astronomical Society, 1995 J. Richard Elliott
openalex +3 more sources