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Measurements of 4He in metal-poor extragalactic H ii regions: the primordial Helium abundance and the ΔY/ΔO ratio

Published online by Cambridge University Press:  23 April 2010

Manuel Peimbert ,
A. Peimbert ,
L. Carigi  and
V. Luridiana
Manuel Peimbert
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. postal 70-264, México D.F. 04510, Mexico email: peimbert@astroscu.unam.mx
A. Peimbert
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. postal 70-264, México D.F. 04510, Mexico email: peimbert@astroscu.unam.mx
L. Carigi
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. postal 70-264, México D.F. 04510, Mexico email: peimbert@astroscu.unam.mx
V. Luridiana
Affiliation:
Instituto de Astrofísica de Canarias, c/ Vía Láctea s/n, 38205 La Laguna, Spain
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Abstract

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We present a review on the determination of the primordial helium abundance Yp, based on the study of hydrogen and helium recombination lines in extragalactic H ii regions. We also discuss the observational determinations of the increase of helium to the increase of oxygen by mass ΔY/ΔO, and compare them with predictions based on models of galactic chemical evolution.

Keywords

ISM: abundances – H ii regions – galaxies: abundancesevolutionirregular – Galaxy: disk – early universe
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S268: Light Elements in the Universe , November 2009 , pp. 91 - 100
Copyright
Copyright © International Astronomical Union 2010

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