The Chemical Composition of the Small Magellanic Cloud HiiRegion NGC 346 and the Primordial Helium Abundance | Zendy

M. Peimbert | Zendy; Antonio Peimbert | Zendy; M. T. Ruíz | Zendy

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The Chemical Composition of the Small Magellanic Cloud HiiRegion NGC 346 and the Primordial Helium Abundance

Author(s) -

M. Peimbert,

Antonio Peimbert,

M. T. Ruíz

Publication year - 2000

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/309485

Subject(s) - astrophysics , physics , helium , nucleosynthesis , abundance (ecology) , small magellanic cloud , chemical composition , telescope , galaxy , abundance of the chemical elements , astronomy , stars , atomic physics , fishery , biology , thermodynamics

Spectrophotometry in the 3400-7400 range is presented for 13 areas of thebrightest H II region in the SMC: NGC 346. The observations were obtained atCTIO with the 4-m telescope. Based on these observations its chemicalcomposition is derived. The helium and oxygen abundances by mass are given by:Y(SMC)=0.2405+-0.0018 and O(SMC)=0.00171+-0.00025. From models and observationsof irregular and blue compact galaxies it is found that dY/dO=3.5+-0.9 andconsequently that the primordial helium abundance by mass is given by:Yp=0.2345+-0.0026 (1-sigma). This result is compared with values derived fromBig Bang nucleosynthesis, and with other determinations of Yp.Comment: 32 pages + 5 figures Referee Revised Versio

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