Atomic Opacities
نویسندگان
چکیده
منابع مشابه
ATOMIC IONIZATION AND OPACITIES IN PULSAR ATMOSPHERES Hydrogen Atmospheres
In the strong magnetic elds of typical radio pulsars atomic lines and photoionization edges lie in the soft X-ray part of the spectrum giving the dominant contribution to the opacity. Improved photoionization cross sections are presented for a hydrogen atmosphere and magnetic elds of 10 11 ? 10 13 G, exhibiting novel Beutler{Fano resonance features due to the contribution of autoionizing atomic...
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We present a comprehensive description of the theory and practice of opacity calculations from the infrared to the ultraviolet needed to generate models of the atmospheres of brown dwarfs and extrasolar giant planets. Methods for using existing line lists and spectroscopic databases in disparate formats are presented and plots of the resulting absorptive opacities versus wavelength for the most...
متن کاملSupernova Neutrino Opacities
In a supernova (SN) core during infall and after collapse, neutrinos are trapped by their interactions with nucleons. For the axial-vector current interactions it is not enough to include static particle-particle correlations. Even the single-nucleon spin autocorrelation reduces the scattering cross section dramatically. Therefore, the dynamical structure of the spin-density structure function ...
متن کاملMolecular opacities for exoplanets.
Spectroscopic observations of exoplanets are now possible by transit methods and direct emission. Spectroscopic requirements for exoplanets are reviewed based on existing measurements and model predictions for hot Jupiters and super-Earths. Molecular opacities needed to simulate astronomical observations can be obtained from laboratory measurements, ab initio calculations or a combination of th...
متن کاملLow Temperature Opacities
Previous computations of low temperature Rosseland and Planck mean opacities from Alexander & Ferguson (1994b) are updated and expanded. The new computations include a more complete equation of state with more grain species and updated optical constants. Grains are now explicitly included in thermal equilibrium in the equation of state calculation, which allows for a much wider range of grain c...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1994
ISSN: 0252-9211
DOI: 10.1017/s0252921100021382