asterseismologyand gaiaastroweb.cwru.edu/heather/323.17/asteroseismology.pdf · asteroseismology...
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Asterseismology andGaia
Asteroseismology candeliveraccuratestellarradiiandmassesHuberetal2017compareresultsondistancesfromGaiaand
asteroseismology for2200Kepler stars
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Asteroseismology
Surfaceconvectionzonesexcitenon-radialoscillations– standingsoundwaves
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DanielHuber
Individual modes of oscillation are described in terms of spherical harmonics. The oscillations are described by their frequency ν and three quantum numbers: the radial order n indicating the number of nodes in the radial direction, the spherical degree l indicating the number of nodal lines on the surface, and the azimuthal order m indicating the number of nodal lines that pass through the rotation axis.
Hekker 2017
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DanielHuberTtemperature,mumolecularweight
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DanielHuber
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DanielHuber
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DanielHuber
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DanielHuber
Sizeofcavity=stellarradius!
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Dispersionrelation
Applieswhenwavesofdifferentwavelengthshavedifferentvelocities- Oneexampleispropagationoflightthroughglass- Anotherisstandingwavesinastar
Frequencyfrelatedto
soundspeed=wavelengthxfrequency
Relatesfrequency,soundspeed,radius
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Integrate1/(soundspeed)throughthestar
DanielHuber
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DanHuber
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Asteroseismology givesadirectmeasureofstellarmeandensity
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Measuringlogg
Hekker 2017
IfwecanmeasureTeff,wecanobtainlogg,mass
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Stellarradiusfromfrequencydata
Huberetal2017
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Asteroseismology summary
• FrequenciesofFourierspectrumofoscillationsgivestellarmeandensityandradiusdirectly
• WiththeadditionofTeff,wecanalsoobtainloggandstellarmass
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Gaiasatellite• LaunchedDec2013• OrbitsL2(secondLagrangepoint,dynamicallystable,noEarthoccultation)• GaiaDataRelease1(DR1),includingTGAS(astrometricsolutionincludingpropermotionsderivedfromTychoandDR1positions)released2016• DR2expectedApril2018
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Gaiaprecision
GaiaDR1paper2016– TGASerrorsoforder.3mas
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Hipparcos hadgeometricdistortionsinreferenceframe… muchlesswithGaia
Brownetal17,GaiaDR1
Hipparcos linkedtoaccurateradioVLBIreferenceframeusingonly12radiostars!Gaiahas295“defining”compactradiosourcestotieitintotheVLBIframe
Kovalevskyetal97
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Radiusandlogg fromKeplerAsteroseismic satellite
SpectroscopicTeff and[Fe/H]fromSDSSAPOGEE
griz photometry2MASSJHKs
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Parallaxfromasteroseismology?
RadiusfromasteroseismologyTeff fromhigh-resspectra->L
BolometriccorrectionfrommodelsusingTeff,logg,[Fe/H],Av
LandBCgiveMv,thenusem-M=5logd– 5+Av
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RadiusfromGaia?
• Bayesiandistancesfrom1/parallax• Thendocalculationinreverse
• ORestimatereddeningusingisochronesandsyntheticphotometryingriz,JHKs,comparewithactualvaluesofmagnitudes/colors
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Extinctionestimatefrom3Dmodelincl Schlafly correction
Notethatthesearesmall…..
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Test
TestBCsusingtwomethods
SystematicerrorsduetoBCs<1%
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GaiaparallaxesvsSeismologyderivedones
Asteroseismic-derivedparallaxesarealittlelarger
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Eclipsingbinaryresultnotsupported(reddashesordots)
Strongestoffsetforlargeparallax(dwarfs)
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CheckoutTeff :distancesscaleasTeff^2.5
CanderiveTeff usingspectroscopicmethods(donehere)ORphotometric.
Inparticular,theInfraRed FluxMethod(IRFM)isaphotometricmethodwhichiswelltiedtofundamentalphysicsbuthasanoffsetoforder100Kfromspectroscopictemperatures
Redidasteroseismic parallaxestimatesusingdifferenttemperaturescale,for(morediscrepant)dwarfsandsubgiants only
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HotterTeff scale(IRFM)reducesdifferencebetweenparallaxesto2%“Asteroseismic andTGASdistancesagreewithinafewpercentoverseveralordersofmagnitude”
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Thefuture:asteroseismic distancesbetterthanGaia’send-of-missiononesford>3kpc
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Summary
Gaia’sTGASparallaxesareprettydarngood… comparisonwithindependentlyestimatedasteroseismic parallaxesshowdifferencesatonlyafewpercent
AttheendoftheGaiamission,asteroseismic distancesforredgiantswillstillbemoreprecisethanGaiaparallaxes.