F. Gilleron
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View article: Author Correction: Helioseismic inference of the solar radiative opacity
Author Correction: Helioseismic inference of the solar radiative opacity Open
View article: Helioseismic inference of the solar radiative opacity
Helioseismic inference of the solar radiative opacity Open
The Sun is the most studied of all stars, and thus constitutes a benchmark for stellar models. However, our vision of the Sun is still incomplete, as illustrated by the current debate on its chemical composition. The problem reaches far be…
View article: Role of configuration interaction and of the number of transitions on iron and nickel spectral opacity
Role of configuration interaction and of the number of transitions on iron and nickel spectral opacity Open
View article: Oxygen opacity experiments for stellar interiors.
Oxygen opacity experiments for stellar interiors. Open
View article: New sum rules for Wigner 3 <i>jm</i> symbols: application to expectation values of hydrogenic ions
New sum rules for Wigner 3 <i>jm</i> symbols: application to expectation values of hydrogenic ions Open
We present new sum rules for 3 jm coefficients, which involve, in addition to the usual weighting factor (2 j + 1) where j is an angular momentum, the quantity [ j ( j + 1)] k with k ⩾ 1. The sum rules appear for instance in the statistica…
View article: Optimized recursion relation for the computation of partition functions in the superconfiguration approach
Optimized recursion relation for the computation of partition functions in the superconfiguration approach Open
View article: A quantitative study of some sources of uncertainty in opacity measurements
A quantitative study of some sources of uncertainty in opacity measurements Open
View article: Electron Broadening Operator Including Penetrating Collisions for Hydrogen
Electron Broadening Operator Including Penetrating Collisions for Hydrogen Open
The expression of the electron broadening operator including the effect of penetrating collisions, i.e., for which the incoming electron enters the extent of bound-electron wave-functions, is rather complicated, even for hydrogen. It invol…
View article: Electron broadening operator including penetrating collisions for hydrogen
Electron broadening operator including penetrating collisions for hydrogen Open
The expression of the electron broadening operator including the effect of penetrating collisions, i.e. for which the incoming electron enters the extent of bound-electron wavefunctions, is rather complicated, even for hydrogen. It involve…
View article: Extreme-UV absorption processes in a laser-produced mid-Z plasma: Measurements and theoretical interpretation
Extreme-UV absorption processes in a laser-produced mid-Z plasma: Measurements and theoretical interpretation Open
View article: Systematic Study of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>L</mml:mi></mml:math>-Shell Opacity at Stellar Interior Temperatures
Systematic Study of -Shell Opacity at Stellar Interior Temperatures Open
The first systematic study of opacity dependence on atomic number at stellar interior temperatures is used to evaluate discrepancies between measured and modeled iron opacity [J. E. Bailey et al., Nature (London) 517, 56 (2015)NATUAS0028-0…
View article: Simultaneous X-ray and XUV absorption measurements in nickel laser-produced plasma close to LTE
Simultaneous X-ray and XUV absorption measurements in nickel laser-produced plasma close to LTE Open
We present an experiment performed in 2016 at the LULI2000 laser facility in which X-ray and XUV absorption structures of nickel hot plasmas were measured simultaneously. Such experiments may provide stringent tests of the accuracy of plas…
View article: Opacity calculations for stellar astrophysics
Opacity calculations for stellar astrophysics Open
Opacity is a key ingredient of stellar structure and evolution. In the present work, we recall the role of opacity in asteroseismology, focusing mainly on two kinds of astrophysical objects: beta Cephei-type stars, and the Sun. The detaile…
View article: H-β Line in a Corona Helium Plasma: A Multi-Code Line Shape Comparison
H-β Line in a Corona Helium Plasma: A Multi-Code Line Shape Comparison Open
Many spectroscopic diagnostics are routinely used as techniques to infer the plasma parameters from line emission spectra, but their accuracy depends on the numerical model or code used for the fitting process. However, the validation of a…
View article: Broadening of the Neutral Helium 492 nm Line in a Corona Discharge: Code Comparisons and Data Fitting
Broadening of the Neutral Helium 492 nm Line in a Corona Discharge: Code Comparisons and Data Fitting Open
Passive plasma spectroscopy is a well-established non-intrusive diagnostic technique. Depending on the emitter and its environment which determine the dominant interactions and effects governing emission line shapes, passive spectroscopy a…
View article: ZEST: A Fast Code for Simulating Zeeman-Stark Line-Shape Functions
ZEST: A Fast Code for Simulating Zeeman-Stark Line-Shape Functions Open
We present the ZEST code, dedicated to the calculation of line shapes broadened by Zeeman and Stark effects. As concerns the Stark effect, the model is based on the Standard Lineshape Theory in which ions are treated in the quasi-static ap…
View article: Broadening of the Neutral Helium 492 nm Line in a Corona Discharge: Code Comparisons and Data Fitting
Broadening of the Neutral Helium 492 nm Line in a Corona Discharge: Code Comparisons and Data Fitting Open
Passive plasma spectroscopy is a well-established non-intrusive diagnostic technique. Depending on the emitter and its environment which determine the dominant interactions and effects governing emission line shapes, passive spectroscopy a…
View article: H-&beta; Line in a Corona Helium Plasma: A Multi-Code Line Shape Comparison
H-β Line in a Corona Helium Plasma: A Multi-Code Line Shape Comparison Open
Many spectroscopic diagnostics are routinely used as a technique to infer the plasma parameters from line emission spectra but their accuracy depends on the numerical model or code used for the fitting process. However, the validation of a…
View article: Detailed Opacity Calculations for Stellar Models
Detailed Opacity Calculations for Stellar Models Open
Radiative opacity is an important quantity in the modeling of stellar structure and evolution. In the present work we recall the role of opacity in the interpretation of pulsations of different kinds of stars. The detailed opacity code SCO…
View article: Opacity data for stellar models and its uncertainties
Opacity data for stellar models and its uncertainties Open
View article: A project based on multi-configuration Dirac–Fock calculations for plasma spectroscopy
A project based on multi-configuration Dirac–Fock calculations for plasma spectroscopy Open
View article: Review of the 9th NLTE code comparison workshop
Review of the 9th NLTE code comparison workshop Open
View article: Comment on “Large Enhancement in High-Energy Photoionization of Fe XVII and Missing Continuum Plasma Opacity”
Comment on “Large Enhancement in High-Energy Photoionization of Fe XVII and Missing Continuum Plasma Opacity” Open
Recent R-matrix calculations claim to provide a significant enhancement in the opacity of Fe XVII due to atomic core excitations and assert that this enhancement is consistent with recent measurements of higher-than-predicted iron opacitie…
View article: Iron Opacity Measurements at Solar Interior Temperatures.
Iron Opacity Measurements at Solar Interior Temperatures. Open
View article: Model uncertainties of local-thermodynamic-equilibrium K-shell spectroscopy
Model uncertainties of local-thermodynamic-equilibrium K-shell spectroscopy Open
View article: DETAILED OPACITY COMPARISON FOR AN IMPROVED STELLAR MODELING OF THE ENVELOPES OF MASSIVE STARS
DETAILED OPACITY COMPARISON FOR AN IMPROVED STELLAR MODELING OF THE ENVELOPES OF MASSIVE STARS Open
Seismic observations have led to doubts or ambiguities concerning the opacity calculations used in stellar physics. Here, we concentrate on the iron-group opacity peak, due to iron, nickel, and chromium, located around T = 200,000 K for de…
View article: Configuration interaction effect on open M shell Fe and Ni LTE spectral opacities, Rosseland and Planck means
Configuration interaction effect on open M shell Fe and Ni LTE spectral opacities, Rosseland and Planck means Open
We have recently shown that iron and nickel open M-shell opacity spectra, up to Δn = 2 are very sensitive to Configuration Interaction (CI) treatments at temperature around 15 eV and for various densities. To do so we had compared extensiv…
View article: Characterization of a hybrid target multi-keV x-ray source by a multi-parameter statistical analysis of titanium K-shell emission
Characterization of a hybrid target multi-keV x-ray source by a multi-parameter statistical analysis of titanium K-shell emission Open
View article: X-ray opacity measurements in mid-Z dense plasmas with a new target design of indirect heating
X-ray opacity measurements in mid-Z dense plasmas with a new target design of indirect heating Open
View article: Radiative properties measurements for stellar interiors and accretion powered objects.
Radiative properties measurements for stellar interiors and accretion powered objects. Open