Solar Mixture Opacity Calculations Using Detailed Configuration and Level Accounting Treatments

Blancard, C.; Cossé, Ph.; Faussurier, G.

doi:10.1088/0004-637x/745/1/10

Cited by 122 publications

(117 citation statements)

References 39 publications

Supporting

Mentioning

107

Contrasting

Order By: Relevance

“…Stellar models have thus relied on tables of opacities computed in local thermodynamic equilibrium (LTE) for a range of elements present in the system of interest. Long-term intensive efforts to produce accurate and comprehensive opacity tables have been underway for many years, with notable efforts being the Opacity Project (OP; Seaton et al 1994;Seaton & Badnell 2004;Badnell et al 2005), the Lawrence Livermore National Laboratory OPAL opacity tables (Rogers & Iglesias 1992;Iglesias & Rogers 1996), and more recently the opacity tables produced using the OPAS code (Blancard et al 2012).The OPAS code has very recently been used to compute opacities for solar mixtures (Le Pennec et al 2015;Mondet et al 2015), and improved agreement with helioseismic observations was reported. The SCO-RCG code (Pain & Gilleron 2015) also appears to be a powerful method with which to compute opacities.…”

Section: Introductionmentioning

confidence: 99%

A New Generation of Los Alamos Opacity Tables

Colgan

Kilcrease

Magee

et al. 2016

ApJ

201

167

View full text Add to dashboard Cite

We present a new, publicly available set of Los Alamos OPLIB opacity tables for the elements hydrogen through zinc. Our tables are computed using the Los Alamos ATOMIC opacity and plasma modeling code, and make use of atomic structure calculations that use fine-structure detail for all the elements considered. Our equation of state model, known as ChemEOS, is based on the minimization of free energy in a chemical picture and appears to be a reasonable and robust approach to determining atomic state populations over a wide range of temperatures and densities. In this paper we discuss in detail the calculations that we have performed for the 30 elements considered, and present some comparisons of our monochromatic opacities with measurements and other opacity codes. We also use our new opacity tables in solar modeling calculations and compare and contrast such modeling with previous work.

show abstract

Section: Introductionmentioning

confidence: 99%

A New Generation of Los Alamos Opacity Tables

Colgan

Kilcrease

Magee

et al. 2016

ApJ

201

167

View full text Add to dashboard Cite

show abstract

“…OP [42,43] 0.59 R-matrix [75,76] 0.51 ATOMIC [39,40] 0.60 OPAS [82][83][84] 0.70 SCO-RCG [17] 0.64 SCRAM [85] 0.77 TOPAZ [86,87] 0.62 Cold [72] 0.75…”

Section: Source κ R Relative To Experimentsmentioning

confidence: 99%

Detailed Opacity Calculations for Astrophysical Applications

Pain

Gilleron

Comet

2017

Atoms

View full text Add to dashboard Cite

Nowadays, several opacity codes are able to provide data for stellar structure models, but the computed opacities may show significant differences. In this work, we present state-of-the-art precise spectral opacity calculations, illustrated by stellar applications. The essential role of laboratory experiments to check the quality of the computed data is underlined. We review some X-ray and XUV laser and Z-pinch photo-absorption measurements as well as X-ray emission spectroscopy experiments involving hot dense plasmas produced by ultra-high-intensity laser irradiation. The measured spectra are systematically compared with the fine-structure opacity code SCO-RCG. The focus is on iron, due to its crucial role in understanding asteroseismic observations of β Cephei-type and Slowly Pulsating B stars, as well as of the Sun. For instance, in β Cephei-type stars, the iron-group opacity peak excites acoustic modes through the "kappa-mechanism". Particular attention is paid to the higher-than-predicted iron opacity measured at the Sandia Z-machine at solar interior conditions. We discuss some theoretical aspects such as density effects, photo-ionization, autoionization or the "filling-the-gap" effect of highly excited states.

show abstract

“…Very recently, a new set of independent opacity calculations, OPAS, has become available [21]. A comparison between OPAS, OP and OPAL is shown in Figure 1 (adapted from [21]).…”

mentioning

confidence: 99%

“…A comparison between OPAS, OP and OPAL is shown in Figure 1 (adapted from [21]). The agreement is in all cases within 5%.…”

mentioning

confidence: 99%