Reanalyzing the He Abundance Determination in Extragalactic H II Regions

Details Reanalyzing the He Abundance Determination in Extragalactic H II Regions Reanalyzing the He Abundance Determination in Extragalactic H II Regions

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002rmxac..12..248g&link_type=abstract

Ionized Gaseous Nebulae, a Conference to Celebrate the 60th Birthdays of Silvia Torres-Peimbert and Manuel Peimbert, Mexico City

Astronomy and Astrophysics

Astronomy

Galaxies: Abundances, H Ii Regions

Scientific paper

The importance of a good determination of the primordial He abundance (Y[p]) has been extensively discussed in the literature. The method generally used to obtain Y[p] was proposed by Peimbert & Torres-Peimbert (1974) and makes use of a correlation between the He mass fraction (Y) and metallicity, extrapolated to zero metallicity. Since the statistical uncertainties in the determination of Y[p] are very small ( ~ 1%), it is essential to discuss possible systematic errors in the determination of Y and consequently of Y[p].

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