On the Chemical Evolution of Our Galaxy

Publications of the Astronomical Society of Japan

Mihara, Kuniko¹  Takahara, Fumio¹ 

[1] Department of Physics, Tokyo Metropolitan University, Minami-ohsawa 1-1, Hachioji, Tokyo 192-03 E-mail(KM):

关键词: "Galaxy: abundances";    "Galaxies: evolution";    "Galaxies: mass-luminosity ratio";    "Galaxies: Milky Way";    Supernovae;   

DOI  :  10.1093/pasj/48.3.467

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

Wehaveinvestigatedthechemicalevolutionofthesolarneighborhoodwithaparticularemphasisontheheliumabundanceandthecurrentsupernova(SN)rate,whiletakingintoaccounttheeffectsofthestellarmasslossonnucleosynthesisinstars.WefoundthattheScaloIMFcanreproducethesolar-heliumabundanceaswellasthecurrentratiooftype-Iatotype-(Ib+II)SNeforasuitablechoiceoftheclosebinaryfraction.Acurrenttype-Iatotype-(Ib+II)SNeratioaslowas0.1isfavoredinordertoreproducethesolar-ironabundance.Wehavenoticedthatthereexistsamethodtoestimatethemass-to-luminosityratioofourGalaxyandtheHubbleconstantbyassumingthatthecurrentSNerateofourGalaxyisthesameasthatofexternalSbcgalaxies.Bycombiningourbestmodelprediction,M/LB=12.3h2,withtheobservedvalue,M/LB=7.6h,weobtainedM/LB=4.7andH0∼62[kms−1Mpc−1]withafairlylargeuncertainty.

【 授权许可】

Unknown