Ledoux criterion
E350920
The Ledoux criterion is an astrophysical stability condition that determines when a stratified stellar layer becomes convectively unstable, accounting for both temperature and composition gradients.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Ledoux criterion canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T3345079 — 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.
Target entity: Ledoux criterion Context triple: [Schwarzschild criterion, isSpecialCaseOf, Ledoux criterion]
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A.
Schwarzschild criterion
The Schwarzschild criterion is a condition in astrophysics that determines when a star’s interior becomes convectively unstable, leading to energy transport by bulk motion of stellar material.
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B.
Courant–Friedrichs–Lewy condition
The Courant–Friedrichs–Lewy condition is a fundamental stability criterion in numerical analysis that restricts the time step size in discretized partial differential equations to ensure convergence of the computed solution.
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C.
Ledoux
Ledoux is a French surname most famously associated with Claude Nicolas Ledoux, an influential 18th-century neoclassical architect and urban planner.
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D.
Goodman–Martínez–Thompson correlation
The Goodman–Martínez–Thompson correlation is the most widely accepted scholarly conversion formula that aligns dates in the ancient Maya Long Count calendar with the Gregorian calendar.
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E.
Saffman
Saffman is a surname most notably associated with Philip G. Saffman, a prominent British-American applied mathematician and fluid dynamicist.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
Target entity: Ledoux criterion Target entity description: The Ledoux criterion is an astrophysical stability condition that determines when a stratified stellar layer becomes convectively unstable, accounting for both temperature and composition gradients.
-
A.
Schwarzschild criterion
The Schwarzschild criterion is a condition in astrophysics that determines when a star’s interior becomes convectively unstable, leading to energy transport by bulk motion of stellar material.
-
B.
Courant–Friedrichs–Lewy condition
The Courant–Friedrichs–Lewy condition is a fundamental stability criterion in numerical analysis that restricts the time step size in discretized partial differential equations to ensure convergence of the computed solution.
-
C.
Ledoux
Ledoux is a French surname most famously associated with Claude Nicolas Ledoux, an influential 18th-century neoclassical architect and urban planner.
-
D.
Goodman–Martínez–Thompson correlation
The Goodman–Martínez–Thompson correlation is the most widely accepted scholarly conversion formula that aligns dates in the ancient Maya Long Count calendar with the Gregorian calendar.
-
E.
Saffman
Saffman is a surname most notably associated with Philip G. Saffman, a prominent British-American applied mathematician and fluid dynamicist.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
astrophysical stability criterion
ⓘ
convective instability criterion ⓘ |
| appliesTo |
stellar interiors
ⓘ
stratified stellar layers ⓘ |
| appliesUnder | linear perturbation theory ⓘ |
| assumes |
hydrostatic equilibrium
ⓘ
local thermodynamic equilibrium ⓘ |
| characterizes | stability against convection ⓘ |
| comparedWith | Schwarzschild criterion ⓘ |
| considers |
composition gradient
ⓘ
mean molecular weight gradient ⓘ temperature gradient ⓘ |
| contrastsWith | Schwarzschild criterion neglecting composition gradients ⓘ |
| dependsOn |
adiabatic temperature gradient
ⓘ
gradient of mean molecular weight ⓘ radiative temperature gradient ⓘ |
| field |
astrophysics
ⓘ
stellar astrophysics ⓘ |
| hasEffectOn |
extent of convective envelopes in stars
ⓘ
size of convective cores in stars ⓘ |
| hasFormulationType | local stability condition ⓘ |
| hasMathematicalForm | inequality involving temperature and composition gradients ⓘ |
| ignores |
magnetic fields
ⓘ
viscosity ⓘ |
| influences |
chemical mixing in stars
ⓘ
nucleosynthesis yields ⓘ stellar lifetimes ⓘ |
| instabilityCondition | layer convectively unstable if combined temperature and composition gradients exceed adiabatic value ⓘ |
| moreGeneralThan | Schwarzschild criterion ⓘ |
| namedAfter | Paul Ledoux ⓘ |
| relatedTo |
semiconvection
ⓘ
thermohaline instability ⓘ |
| relatesTo | Brunt–Väisälä frequency ⓘ |
| stabilityCondition | layer stable if stabilizing composition gradient overcomes destabilizing temperature gradient ⓘ |
| usedBy | stellar evolution codes ⓘ |
| usedFor |
determining convective instability
ⓘ
determining dynamical stability of stellar layers ⓘ |
| usedIn |
asteroseismology interpretations
ⓘ
massive star evolution modeling ⓘ mixing processes in stars ⓘ modeling double-diffusive convection ⓘ modeling of massive main-sequence stars ⓘ modeling of red giant stars ⓘ modeling semiconvective zones ⓘ stellar evolution calculations ⓘ stellar structure models ⓘ |
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Subject: Ledoux criterion Description of subject: The Ledoux criterion is an astrophysical stability condition that determines when a stratified stellar layer becomes convectively unstable, accounting for both temperature and composition gradients.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.