Computer Science – Databases
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990stin...9022480r&link_type=abstract
Presented at the Atomic Processes in Plasmas, Gaithersburg, MD, 2-5 Oct. 1989
Computer Science
Databases
Algorithms, Architecture (Computers), Computer Programs, Data Bases, Equations Of State, Opacity, Cepheid Variables, On-Line Systems, Solar Interior, Sun
Scientific paper
Persisting discrepancies between theory and observation in a number of astrophysical properties has led to the conjecture that opacity databases may be inaccurate. The OPAL opacity code was developed to address this question. The physical basis of OPAL removes several of the approximations present in past calculations. For example, it utilizes a much larger and more detailed set of atomic data than was used to construct the Los Alamos Astrophysical Library. This data is generated online, in LS or intermediate coupling, from prefitted analytic effective potentials and is of similar quality as single configuration, relativistic, self consistent field calculations. The OPAL code was used to calculate opacities for the solar core and for Cepheid variable stars. In both cases, significant increases in the opacity compared to the Los Alamos Astrophysical Library were found.
Iglesias Carlo A.
Rogers Forrest J.
Wilson Brian G.
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