|
gptkbp:instanceOf
|
variable star
|
|
gptkbp:ageRange
|
10 million to 300 million years
|
|
gptkbp:alsoKnownAs
|
gptkb:Delta_Cephei_variables
gptkb:Type_I_Cepheids
|
|
gptkbp:brightnessVariation
|
up to 2 magnitudes
|
|
gptkbp:color
|
yellow-white to red
|
|
gptkbp:discoveredBy
|
gptkb:Henrietta_Swan_Leavitt
|
|
gptkbp:discoveredIn
|
1908
|
|
gptkbp:distance
|
primary
|
|
gptkbp:distanceRangeObserved
|
up to 30 million light years
|
|
gptkbp:enveloped
|
hydrogen rich
|
|
gptkbp:evolutionaryStage
|
post-main sequence
|
|
gptkbp:firstObserved
|
gptkb:Small_Magellanic_Cloud
|
|
gptkbp:foundIn
|
open clusters
spiral arms of galaxies
|
|
gptkbp:galacticDistribution
|
disk population
|
|
gptkbp:hasConcept
|
helium burning
|
|
gptkbp:heliumIonizationZone
|
drives pulsation
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Classical Cepheids
|
|
gptkbp:importantFor
|
standard candle
|
|
gptkbp:lightCurvePeriodicity
|
highly regular
|
|
gptkbp:lightCurveShape
|
asymmetric
|
|
gptkbp:locatedIn
|
gptkb:Milky_Way
other galaxies
|
|
gptkbp:luminosity
|
I
|
|
gptkbp:metallicity
|
high
affects period-luminosity relation
|
|
gptkbp:namedAfter
|
gptkb:Delta_Cephei
|
|
gptkbp:notToBeConfusedWith
|
gptkb:Type_II_Cepheids
gptkb:anomalous_Cepheids
|
|
gptkbp:periodChange
|
can occur over time
|
|
gptkbp:periodLuminosityDiscovery
|
gptkb:Henrietta_Swan_Leavitt
|
|
gptkbp:periodLuminosityRelation
|
yes
|
|
gptkbp:periodRange
|
1 to 100 days
|
|
gptkbp:population
|
gptkb:Population_I
|
|
gptkbp:prototype
|
gptkb:Delta_Cephei
|
|
gptkbp:pulsationMechanism
|
kappa mechanism
|
|
gptkbp:pulsationMode
|
fundamental
overtone
|
|
gptkbp:range
|
3 to 12 solar masses
|
|
gptkbp:spectralType
|
F6 to K2
|
|
gptkbp:surfaceTemperatureRange
|
5000 to 7000 K
|
|
gptkbp:usedBy
|
gptkb:Edwin_Hubble
|
|
gptkbp:usedFor
|
gptkb:cosmic_distance_ladder
distance measurement
calibrating Hubble constant
|
|
gptkbp:usedToDiscover
|
expansion of the universe
|
|
gptkbp:variabilityDiscovery
|
gptkb:Henrietta_Swan_Leavitt
|
|
gptkbp:variant
|
radially pulsating
|
|
gptkbp:bfsParent
|
gptkb:Cepheid_variable_stars
|
|
gptkbp:bfsLayer
|
6
|