white dwarf

URI: https://gptkb.org/entity/white_dwarf

GPTKB entity

AI-created image

Statements (136)

Predicate	Object
gptkbp:instanceOf	gptkb:star astronomer hypothetical star
gptkbp:age	can be millions of years
gptkbp:alternativeName	gptkb:TŻO collapsed star degenerate star Thorne–Żytkow_object Wolf-Rayet_star Wolf–Rayet_star brown_dwarf dwarf_nova neutron_star red_dwarf
gptkbp:associatedWith	gptkb:gamma-ray_bursts nebulae star-forming regions stellar wind bubbles
gptkbp:canBe	gptkb:magnetar white dwarf supernova pulsar black hole binary star system runaway star
gptkbp:canBeBinary	false true
gptkbp:canMergeToForm	supernova black hole
gptkbp:cataloguedIn	gptkb:SIMBAD gptkb:Wolf-Rayet_Catalogue Wolf–Rayet catalogue
gptkbp:characteristic	broad emission lines depleted hydrogen helium-rich atmosphere high mass loss rate strong stellar winds
gptkbp:compatibleWith	white dwarf stellar classification black hole
gptkbp:composedOf	gptkb:neutrons
gptkbp:density	extremely high
gptkbp:describedBy	star with a neutron star core inside a red supergiant envelope
gptkbp:discoveredBy	gptkb:Walter_Baade gptkb:Fritz_Zwicky gptkb:Charles_Wolf gptkb:Georges_Rayet
gptkbp:discoveredIn	1867 1934
gptkbp:emits	gptkb:X-rays gptkb:gamma_rays gptkb:radio_waves radiation therapy visible light
gptkbp:evolutionaryStage	late stage massive star
gptkbp:firstCataloguedBy	1867
gptkbp:firstObserved	gptkb:Paris_Observatory 1867
gptkbp:form	evolved from O-type star
gptkbp:frequency	rare
gptkbp:hasCompanion	can be in binary system
gptkbp:hasCoreCity	superfluid neutrons
gptkbp:hasCrust	gptkb:stone
gptkbp:hasEmissionLine	gptkb:He_II gptkb:N_III gptkb:C_III gptkb:O_VI
gptkbp:hasEquationOfState	unknown
gptkbp:hasEscapeVelocity	about 0.4c
gptkbp:hasGravitationalField	extremely strong
gptkbp:hasGravitationalRedshift	significant
gptkbp:hasGravitationalWaves	from mergers
gptkbp:hasNameExample	gptkb:Crab_Pulsar gptkb:PSR_B1919+21 gptkb:PSR_J0348+0432 gptkb:Vela_Pulsar
gptkbp:hasRadius	about 10 kilometers
gptkbp:hasSpinDown	due to magnetic braking
gptkbp:hasUnusualElementAbundances	yes
gptkbp:heliumContent	high
gptkbp:hydrogenContent	low
gptkbp:lifespan	short few hundred thousand years
gptkbp:locatedIn	universe galaxies
gptkbp:location	gptkb:Milky_Way other galaxies
gptkbp:luminosity	varies up to several million times Sun
gptkbp:magneticFieldStrength	very strong
gptkbp:mass	1.1 to 2.3 solar masses 10–25 solar masses
gptkbp:metallicity	high
gptkbp:namedAfter	gptkb:Kip_Thorne gptkb:Anna_Żytkow gptkb:Charles_Wolf gptkb:Georges_Rayet
gptkbp:namedFor	gptkb:Wolf–Rayet
gptkbp:notableExample	gptkb:HD_56925 gptkb:Gamma_Velorum gptkb:WR_104 gptkb:WR_124 gptkb:WR_136
gptkbp:observedBy	gptkb:X-ray_telescopes gptkb:gamma-ray_telescopes radio telescopes
gptkbp:originatedIn	gptkb:core-collapse_supernova
gptkbp:possibleCandidate	gptkb:HV_2112
gptkbp:predictedToBeRare	yes
gptkbp:proposedBy	gptkb:Kip_Thorne gptkb:Anna_Żytkow 1977
gptkbp:range	10–25 solar masses
gptkbp:relatedTo	gptkb:Luminous_blue_variable stellar classification supernova progenitor
gptkbp:remnants	supernova
gptkbp:rotationPeriod	milliseconds to seconds
gptkbp:shape	nearly spherical
gptkbp:spectralType	gptkb:WO WC WN
gptkbp:studiedIn	astrophysics stellar evolution
gptkbp:subclassOf	massive star
gptkbp:surface	gptkb:helium carbon nitrogen oxygen thin atmosphere
gptkbp:surfaceGravity	very strong
gptkbp:temperature	about 600,000 K 30,000–200,000 K
gptkbp:theorizedToFormBy	merger of a neutron star and a red supergiant
gptkbp:bfsParent	gptkb:Tolman–Oppenheimer–Volkoff_limit
gptkbp:bfsLayer	4