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FormationandevolutionoftheGalacticbulge:
--Constraintsfromstellarabundances
S.K.Ballero,F.Matteucci,L.Origlia,R.M.Rich
ContentsBackgroundAimThechemicalevolutionmodelsThedata(fromstarsandPNe)ModelresultsSummary
BackgroundBulgeunlikediskbutsimilarwithellipticalgalaxiesWiderangeof[Fe/H],enhancementofα-elements,narrowagedispersionOld,andformedinashorttimescale(1GYr)NotformedviaaccretionofsatellitesModelsOne-zonemodel,chemo-dynamicalmodel,multiphasemodel,doubleinfallmodel
AimComparingiron,α-elements,carbonandnitrogenabundanceswithmodelsTotestthehypothesisofaquickdissipationalcollapseviathestudyoftheevolutionoftheabundanceratioscoupledwithconsiderationsonthemetallicitydistributionBasedonMRM99(Matteucci,RomanoMolaro,1999,AA,341,458)
ContentsBackgroundAimThechemicalevolutionmodelsThedata(fromstarsandPNe)ModelresultsSummary
Model–bulgeformedwiththefastcollapseofprimordialgasaccumulatinginthecenterofGalaxyInstantaneousmixingapproximationSFR:IMF:(0.1–100M⊕)GashasaprimordialchemicalcompositionandaccretesatarategivebyInstantaneousrecyclingapproximationisrelaxedDetailednucleosynthesisprescriptionsaretakenfromFrancoisetal.(2004)TypeIaSNratefromGreggioRenzini(1983),MatteucciRecchi(2001);Fe,lightelements,someSiCaLIMS(0.8–8M⊕):12C,N,heavys-elements(VanDenHoekGroenewegen1997)MS(10M⊕):WoosleyWeaver(1995)+someConstraintsSMS(40M⊕-20M⊕):extrapolateWW95
ModelGasinfallandSFstopwhenSN-drivengalacticwindstartsat:Feedbackfromcentralblackholeisnegligible.
Consideredmodelsχ=0.33forM1M⊕(Zoccalietal.2000)Scalo(1986),χ=1.35(1M/M⊕2)=1.7(M/M⊕2)
ContentsBackgroundAimThechemicalevolutionmodelsThedata(fromstarsandPNe)ModelresultsSummary
Thedata–Metallicitydistribution503bulgegiantstarsfromZ03(Zoccali
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