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

Publications of the Astronomical Society of Japan

Shibahashi, Hiromoto¹  Takata, Masao¹ 

[1] Department of Astronomy, School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113

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

DOI  :  10.1093/pasj/48.2.377

学科分类：天文学(综合)

来源: Oxford University Press

【 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.

【 授权许可】

Unknown