A Seismic Solar Model Deduced from the Sound-Speed Distribution and an Estimate of the Neutrino Fluxes

[摘要] Wehavededucedthedensity,pressure,temperature,andhydrogenprofilesinthesolarinteriorbysolvingthebasicequationsgoverningthestellarstructurewiththeimpositionthatthesound-speedprofileisthatdeterminedbythehelioseismicdataofLibbrechtetal.(1990;AAA52.080.103)andJiménezetal.(1988;AAA45.080.041).Thisapproachiscompletelydifferentfromthatofthestandardsolarmodel,andisbasedonmoreexperimentallywell-determineddata.Wesolvedtheequationsbyrequiringthatthemassandmeanmolecularweightatthesurfacematchthesolarmassandacertainfixedvalue,respectively,astheouterboundaryconditions.Togetherwiththeseconditionsandtheappropriateinnerboundaryconditions,theseequationswerereducedtoaboundary-valueproblem.Weexaminedwhethertheluminosityatthesurfacematchestheobservedvalue.TheerrorlevelswereestimatedbyaMonte-CarlosimulationwithGaussiannoiseonthesound-speedprofile.Thethus-constructedseismicmodelmarginallysatisfiestheluminositycondition,L(R⊙)=L⊙,atthe3σlevel.Usingthisseismicmodel,weestimatedtheneutrinofluxes,andfoundthatthe8Bneutrinofluxisabout60%ofthatofthestandardsolarmodel.ThismodeldoesnotseemtocontradicttheKamiokandeneutrinodetectionexperiment.The7Beneutrinofluxofthemodelisabout20%smallerthanthestandardsolarmodel,andthepp-neutrinofluxofthemodelisalmostthesameasthatofthestandardsolarmodel.Weestimatedthetotalneutrinocapturerateofthechlorineexperiment(Homestake)andthatofthegalliumexperiments(GALLEXandSAGE),exceptforacontributionfromtheCNOcycle,byscalingthecaptureratesbasedonthestandardsolarmodel.Thethus-estimatedcaptureratesare5.62SNUand117SNU,respectively,andarehigherthanthoseobservedatthe3σerrorlevel.

[学科分类] 天文学(综合)

[关键词] Helioseismology;Neutrinos;"Sun: interior";"Sun: oscillations"