Light element opacities of astrophysical interest from ATOMIC
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)
- Computational Physics Division, Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)
We present new calculations of local-thermodynamic-equilibrium (LTE) light element opacities from the Los Alamos ATOMIC code for systems of astrophysical interest. ATOMIC is a multi-purpose code that can generate LTE or non-LTE quantities of interest at various levels of approximation. Our calculations, which include fine-structure detail, represent a systematic improvement over previous Los Alamos opacity calculations using the LEDCOP legacy code. The ATOMIC code uses ab-initio atomic structure data computed from the CATS code, which is based on Cowan's atomic structure codes, and photoionization cross section data computed from the Los Alamos ionization code GIPPER. ATOMIC also incorporates a new equation-of-state (EOS) model based on the chemical picture. ATOMIC incorporates some physics packages from LEDCOP and also includes additional physical processes, such as improved free-free cross sections and additional scattering mechanisms. Our new calculations are made for elements of astrophysical interest and for a wide range of temperatures and densities.
- OSTI ID:
- 22121637
- Journal Information:
- AIP Conference Proceedings, Vol. 1545, Issue 1; Conference: ICAMDATA-2012: 8. international conference on atomic and molecular data and their applications, Gaithersburg, MD (United States), 30 Sep - 4 Oct 2012; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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