RR Lyrae variable stars

E492359

Population II star horizontal branch star pulsating variable star standard candle

RR Lyrae variable stars are old, low-mass pulsating stars used as standard candles to measure distances within the Milky Way and nearby galaxies.

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All labels observed (4)

Label	Occurrences
RR Lyrae variable stars canonical	8
RR Lyrae variables	8
RR Lyrae	3
RR Lyrae stars	2

How this entity was disambiguated

This entity first appeared as the object of triple T5088989 — 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: RR Lyrae variable stars
Context triple: [SMC, contains, RR Lyrae variable stars]

A. Delta Scuti
Delta Scuti is a variable star in the constellation Scutum, serving as the prototype of the Delta Scuti class of short-period pulsating stars.
B. variable star R Scuti
R Scuti is a luminous RV Tauri-type pulsating variable star in the constellation Scutum, notable for its large, irregular brightness variations and advanced evolutionary stage.
C. variable star VY Scuti
Variable star VY Scuti is a highly luminous red supergiant located in the constellation Scutum and is among the largest known stars by radius.
D. Cepheid
Cepheid is a molecular diagnostics company known for its rapid, automated PCR-based testing systems used in clinical and research settings.
E. UY Scuti
UY Scuti is a 2021 studio album by Nigerian rapper and singer Olamide that blends Afrobeats, hip-hop, and pop influences.
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: RR Lyrae variable stars
Target entity description: RR Lyrae variable stars are old, low-mass pulsating stars used as standard candles to measure distances within the Milky Way and nearby galaxies.

A. Delta Scuti
Delta Scuti is a variable star in the constellation Scutum, serving as the prototype of the Delta Scuti class of short-period pulsating stars.
B. variable star R Scuti
R Scuti is a luminous RV Tauri-type pulsating variable star in the constellation Scutum, notable for its large, irregular brightness variations and advanced evolutionary stage.
C. variable star VY Scuti
Variable star VY Scuti is a highly luminous red supergiant located in the constellation Scutum and is among the largest known stars by radius.
D. Cepheid
Cepheid is a molecular diagnostics company known for its rapid, automated PCR-based testing systems used in clinical and research settings.
E. UY Scuti
UY Scuti is a 2021 studio album by Nigerian rapper and singer Olamide that blends Afrobeats, hip-hop, and pop influences.
F. None of above. chosen

Statements (49)

Predicate	Object
instanceOf	Population II star ⓘ horizontal branch star ⓘ pulsating variable star ⓘ standard candle ⓘ
calibratedBy	Gaia mission data ⓘ parallax measurements ⓘ
discovered	early 20th century ⓘ
distanceScaleUse	Local Group distance scale ⓘ Milky Way distance scale ⓘ
evolutionaryStage	core helium-burning phase ⓘ
foundIn	Milky Way ⓘ galactic halo ⓘ globular cluster ⓘ nearby galaxy ⓘ
hostGalaxyComponent	dwarf spheroidal galaxy ⓘ thick disk ⓘ
lightCurveShapeRRab	asymmetric sawtooth ⓘ
lightCurveShapeRRc	more sinusoidal ⓘ
locatedIn	instability strip ⓘ
metallicity	metal-poor ⓘ
namedAfter	RR Lyrae ⓘ linked to: RR Lyrae variable stars
observationalBand	infrared ⓘ optical ⓘ
periodLuminosityRelation	present but weaker in optical bands ⓘ tight in infrared bands ⓘ
RRabCharacteristics	fundamental-mode pulsators ⓘ
RRcCharacteristics	first-overtone pulsators ⓘ
RRdCharacteristics	double-mode pulsators ⓘ
spectralTypeRange	A to F ⓘ
subclass	RRab ⓘ RRc ⓘ RRd ⓘ
tracesComponent	old bulge population ⓘ stellar halo ⓘ
typicalAbsoluteMagnitudeV	around +0.6 ⓘ
typicalAge	old ⓘ
typicalAmplitudeRangeV	0.3 to 2 magnitudes ⓘ
typicalEffectiveTemperatureRange	about 6000 to 7500 K ⓘ
typicalLocationInCluster	horizontal branch of color-magnitude diagram ⓘ
typicalLuminosity	about 40 to 50 times solar luminosity ⓘ
typicalMass	about 0.6 to 0.8 solar masses ⓘ
typicalMetallicityRange	[Fe/H] from about −2.5 to −0.5 ⓘ
typicalPeriodRange	0.2 to 1 day ⓘ
typicalPopulation	Population II ⓘ
usedFor	Galactic structure studies ⓘ distance measurement ⓘ tracing old stellar populations ⓘ
variabilityCause	radial pulsation ⓘ
variabilityMechanism	kappa mechanism ⓘ

How these facts were elicited