Update on the OPAL opacity code
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 has been 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 has been 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. 37 refs., 2 figs., 1 tab.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- DOE/DP
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6991070
- Report Number(s):
- UCRL-JC-103348; CONF-891052-2; ON: DE90009946
- Resource Relation:
- Journal Volume: 206; Conference: Atomic processes in plasmas, Gaithersburg, MD (USA), 2-5 Oct 1989
- Country of Publication:
- United States
- Language:
- English
Similar Records
OPAL opacities
Updated opal opacities
Related Subjects
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
CEPHEIDS
OPACITY
COMPUTER CALCULATIONS
SUN
ABSORPTION
ALGORITHMS
ATOMIC PHYSICS
COMPUTER ARCHITECTURE
EQUATIONS OF STATE
O CODES
PLASMA
COMPUTER CODES
EQUATIONS
MAIN SEQUENCE STARS
MATHEMATICAL LOGIC
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PHYSICS
PULSATING VARIABLE STARS
STARS
VARIABLE STARS
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources
640104 - Astrophysics & Cosmology- Solar Phenomena
640302 - Atomic
Molecular & Chemical Physics- Atomic & Molecular Properties & Theory
990200 - Mathematics & Computers