Systematic Effects and a New Determination of the Primordial Abundance of4He anddY/dZfrom Observations of Blue Compact Galaxies | Zendy

Y. I. Izotov | Zendy; T. X. Thuan | Zendy

Open Access

Systematic Effects and a New Determination of the Primordial Abundance of⁴He anddY/dZfrom Observations of Blue Compact Galaxies

Author(s) -

Y. I. Izotov,

T. X. Thuan

Publication year - 2004

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 - 10.1086/380830

Subject(s) - physics , metallicity , astrophysics , nucleosynthesis , galaxy , analytical chemistry (journal) , big bang nucleosynthesis , excited state , mass fraction , linear regression , atomic physics , stars , chemistry , statistics , chromatography , thermodynamics , mathematics

We use spectroscopic observations of a sample of 82 HII regions in 76 bluecompact galaxies to determine the primordial helium abundance Yp and the slopedY/dZ from the Y-O/H linear regression. To improve the accuracy of the dY/dZmeasurement, we have included new spectrophotometric observations of 33 HIIregions which span a large metallicity range, with oxygen abundance 12+log(O/H)varying between 7.43 and 8.30 (Zsun/30

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