Relativistic opacities for astrophysical applications
Abstract
Here, we report on the use of the Los Alamos suite of relativistic atomic physics codes to generate radiative opacities for the modeling of astrophysically relevant plasmas under local thermodynamic equilibrium (LTE) conditions. The atomic structure calculations are carried out in fine-structure detail, including full configuration interaction. Three example applications are considered: iron opacities at conditions relevant to the base of the solar convection zone, nickel opacities for the modeling of stellar envelopes, and samarium opacities for the modeling of light curves produced by neutron star mergers. In the first two examples, comparisons are made between opacities that are generated with the fully and semi-relativistic capabilities in the Los Alamos suite of codes. As expected for these highly charged, iron-peak ions, the two methods produce reasonably similar results, providing confidence that the numerical methods have been correctly implemented. However, discrepancies greater than 10% are observed for nickel and investigated in detail. In the final application, the relativistic capability is used in a preliminary investigation of the complicated absorption spectrum associated with cold lanthanide elements.
- Authors:
-
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1329688
- Alternate Identifier(s):
- OSTI ID: 1251674
- Report Number(s):
- LA-UR-15-23684
Journal ID: ISSN 1574-1818
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- High Energy Density Physics
- Additional Journal Information:
- Journal Volume: 16; Journal Issue: C; Journal ID: ISSN 1574-1818
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; relativistic atomic data; LTE opacities; neutron star mergers
Citation Formats
Fontes, Christopher John, Fryer, Christopher Lee, Hungerford, Aimee L., Hakel, Peter, Colgan, James Patrick, Kilcrease, David Parker, and Sherrill, Manalo Edgar. Relativistic opacities for astrophysical applications. United States: N. p., 2015.
Web. doi:10.1016/j.hedp.2015.06.002.
Fontes, Christopher John, Fryer, Christopher Lee, Hungerford, Aimee L., Hakel, Peter, Colgan, James Patrick, Kilcrease, David Parker, & Sherrill, Manalo Edgar. Relativistic opacities for astrophysical applications. United States. https://doi.org/10.1016/j.hedp.2015.06.002
Fontes, Christopher John, Fryer, Christopher Lee, Hungerford, Aimee L., Hakel, Peter, Colgan, James Patrick, Kilcrease, David Parker, and Sherrill, Manalo Edgar. 2015.
"Relativistic opacities for astrophysical applications". United States. https://doi.org/10.1016/j.hedp.2015.06.002. https://www.osti.gov/servlets/purl/1329688.
@article{osti_1329688,
title = {Relativistic opacities for astrophysical applications},
author = {Fontes, Christopher John and Fryer, Christopher Lee and Hungerford, Aimee L. and Hakel, Peter and Colgan, James Patrick and Kilcrease, David Parker and Sherrill, Manalo Edgar},
abstractNote = {Here, we report on the use of the Los Alamos suite of relativistic atomic physics codes to generate radiative opacities for the modeling of astrophysically relevant plasmas under local thermodynamic equilibrium (LTE) conditions. The atomic structure calculations are carried out in fine-structure detail, including full configuration interaction. Three example applications are considered: iron opacities at conditions relevant to the base of the solar convection zone, nickel opacities for the modeling of stellar envelopes, and samarium opacities for the modeling of light curves produced by neutron star mergers. In the first two examples, comparisons are made between opacities that are generated with the fully and semi-relativistic capabilities in the Los Alamos suite of codes. As expected for these highly charged, iron-peak ions, the two methods produce reasonably similar results, providing confidence that the numerical methods have been correctly implemented. However, discrepancies greater than 10% are observed for nickel and investigated in detail. In the final application, the relativistic capability is used in a preliminary investigation of the complicated absorption spectrum associated with cold lanthanide elements.},
doi = {10.1016/j.hedp.2015.06.002},
url = {https://www.osti.gov/biblio/1329688},
journal = {High Energy Density Physics},
issn = {1574-1818},
number = C,
volume = 16,
place = {United States},
year = {Mon Jun 29 00:00:00 EDT 2015},
month = {Mon Jun 29 00:00:00 EDT 2015}
}
Web of Science
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Figures / Tables found in this record: