A cosmic abundance standard chemical homogeneity of the sola(4)

2021-09-24 19:55

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Finally,wecombineourB-starabundanceswithdataforS,ClandArfromtheanalysisoftheOrionnebula(E04)andsolarmeteoriticvaluesforotherabundantrefractoryelements(withε(El) 5,AGS05)toderivemassfractionsforhydro-gen,heliumandthemetals.ValuesofX=0.715,Y=0.271,Z=0.014andZ/X=0.020characterizethepresent-daycos-micmatterinthesolarneighbourhood(tobecomparedtoprotosolarvaluesX0=0.7133,Y0=0.2735andZ0=0.0132,Grevesseetal.2007).Thesecombinedabundancesareourrecommendedvaluesforawiderangeofapplicationsrequir-inganaccurateknowledgeofthechemicalcompositionatpresent(e.g.foropacitycalculations),examplesbeingmod-elsofstar/planetformationorstellarevolution(inparticularofshort-livedmassivestars),orfortheempiricalcalibrationofGalactochemicalevolutionmodels.

WeexpressourdeepgratitudetoU.Heberforconstantsup-portoftheprojectandusefulcommentsonthemanuscript,andthankM.Asplundforstimulatingdiscussion.M.F.N.ac-knowledgessupportbyDFG(grantHE1356/45-1).

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REFERENCES


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