OPAL opacity project
E236566
The OPAL opacity project is a major astrophysical research initiative that provides detailed, high-precision tables of stellar opacities used in modeling the structure and evolution of stars.
All labels observed (3)
| Label | Occurrences |
|---|---|
| OPAL opacity project canonical | 2 |
| Iglesias and Rogers 1996 ApJ updated opacity tables paper | 1 |
| Rogers and Iglesias 1992 ApJS opacity tables paper | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2126320 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: OPAL opacity project Context triple: [Rosseland mean opacity, relatedTo, OPAL opacity project]
-
A.
OPAL
OPAL was one of the major particle physics experiments at CERN’s Large Electron–Positron Collider, designed to study electron-positron collisions and probe the Standard Model.
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B.
Rosseland mean opacity
Rosseland mean opacity is an average measure of a material’s opacity weighted toward frequencies where radiation is most effectively transported, widely used in stellar and astrophysical radiative transfer calculations.
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C.
OPA
OPA is a U.S. federal law enacted in 1990 that strengthens regulations and liability standards for preventing and responding to oil spills in navigable waters and shorelines.
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D.
Onyx visualization systems
Onyx visualization systems are high-performance graphics supercomputers from SGI designed for advanced 3D visualization, simulation, and scientific computing applications.
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E.
Open GLAM program
The Open GLAM program is a Creative Commons initiative that supports galleries, libraries, archives, and museums in opening up their collections and data for public access and reuse.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: OPAL opacity project Target entity description: The OPAL opacity project is a major astrophysical research initiative that provides detailed, high-precision tables of stellar opacities used in modeling the structure and evolution of stars.
-
A.
OPAL
OPAL was one of the major particle physics experiments at CERN’s Large Electron–Positron Collider, designed to study electron-positron collisions and probe the Standard Model.
-
B.
Rosseland mean opacity
Rosseland mean opacity is an average measure of a material’s opacity weighted toward frequencies where radiation is most effectively transported, widely used in stellar and astrophysical radiative transfer calculations.
-
C.
OPA
OPA is a U.S. federal law enacted in 1990 that strengthens regulations and liability standards for preventing and responding to oil spills in navigable waters and shorelines.
-
D.
Onyx visualization systems
Onyx visualization systems are high-performance graphics supercomputers from SGI designed for advanced 3D visualization, simulation, and scientific computing applications.
-
E.
Open GLAM program
The Open GLAM program is a Creative Commons initiative that supports galleries, libraries, archives, and museums in opening up their collections and data for public access and reuse.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
astrophysical research project
ⓘ
opacity calculation project ⓘ |
| acronymFor | Opacity Project at Livermore ⓘ |
| applicableTo |
high-temperature plasmas
ⓘ
stellar interiors ⓘ |
| basedAt | Lawrence Livermore National Laboratory ⓘ |
| comparedWith |
OP opacity project
ⓘ
surface form:
OP (Opacity Project)
|
| compositionParameter |
helium mass fraction
ⓘ
hydrogen mass fraction ⓘ metallicity ⓘ |
| computes |
Rosseland mean opacities
ⓘ
radiative opacities ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| dataAccess | publicly available opacity tables ⓘ |
| densityRange | wide range of stellar densities ⓘ |
| developedBy |
Carlos A. Iglesias
ⓘ
Forest J. Rogers ⓘ |
| enabled | more accurate stellar evolution calculations ⓘ |
| field | astrophysics ⓘ |
| focusesOn | stellar opacities ⓘ |
| goal | provide accurate, consistent stellar opacity data ⓘ |
| impact |
influenced modern stellar evolution codes
ⓘ
standard reference for stellar opacities ⓘ |
| improved | accuracy of stellar opacity data ⓘ |
| includes |
bound-bound transitions
ⓘ
bound-free transitions ⓘ electron scattering ⓘ free-free transitions ⓘ |
| institutionType | national laboratory project ⓘ |
| notablePublication |
OPAL opacity project
self-linksurface differs
ⓘ
surface form:
Iglesias and Rogers 1996 ApJ updated opacity tables paper
OPAL opacity project self-linksurface differs ⓘ
surface form:
Rogers and Iglesias 1992 ApJS opacity tables paper
|
| outputFormat | tabulated opacity tables ⓘ |
| provides | opacity tables ⓘ |
| relatedConcept |
equation of state in stellar interiors
ⓘ
radiative transfer in stars ⓘ |
| resolution | high-precision opacity data ⓘ |
| temperatureRange | 10^3–10^8 K ⓘ |
| timePeriod | late 20th century development ⓘ |
| usedBy |
MESA stellar evolution code
ⓘ
various 1D stellar evolution codes ⓘ |
| usedFor |
stellar evolution modeling
ⓘ
stellar structure modeling ⓘ |
| usedIn |
helioseismology studies
ⓘ
massive star evolution models ⓘ standard solar models ⓘ stellar pulsation models ⓘ |
| uses |
detailed atomic physics calculations
ⓘ
equation-of-state models ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: OPAL opacity project Description of subject: The OPAL opacity project is a major astrophysical research initiative that provides detailed, high-precision tables of stellar opacities used in modeling the structure and evolution of stars.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Rogers and Iglesias 1992 ApJS opacity tables paper
this entity surface form:
Iglesias and Rogers 1996 ApJ updated opacity tables paper