Update on the opal opacity code

Conference · Tue May 01 00:00:00 EDT 1990 · AIP Conference Proceedings (American Institute of Physics); (USA)

OSTI ID:6316684

Rogers, F J; Iglesias, C A; Wilson, B G ^[1]

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1. Lawrence Livermore National Laboratory, Livermore, California 94550 (USA)

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.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6316684
• Report Number(s): CONF-891052-; CODEN: APCPC; TRN: 91-001948
• Journal Information: AIP Conference Proceedings (American Institute of Physics); (USA), Vol. 206:1; Conference: 7. American Physical Society topical conference on atomic processes in plasmas, Gaithersburg, MD (USA), 2-5 Oct 1989; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
STELLAR ATMOSPHERES
OPACITY
CEPHEIDS
COMPUTER CODES
DATA COMPILATION
EQUATIONS OF STATE
L-S COUPLING
PHOTOIONIZATION
SELF-CONSISTENT FIELD
SOLAR NEUTRINOS
ATMOSPHERES
COUPLING
DATA
ELEMENTARY PARTICLES
EQUATIONS
FERMIONS
INFORMATION
INTERMEDIATE COUPLING
IONIZATION
LEPTONS
MASSLESS PARTICLES
NEUTRINOS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PULSATING VARIABLE STARS
RADIATIONS
SOLAR PARTICLES
SOLAR RADIATION
STARS
STELLAR RADIATION
VARIABLE STARS
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources