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On the total O/H abundance ratio in Galactic and extragalactic H ii regions

Published online by Cambridge University Press:  23 April 2010

Antonio Peimbert  and
Manuel Peimbert
Antonio Peimbert
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. postal 70-264, México D.F. 04510, Mexico email: antonio@astroscu.unam.mx
Manuel Peimbert
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. postal 70-264, México D.F. 04510, Mexico email: antonio@astroscu.unam.mx
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Abstract

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To determine the primordial helium abundance and to study the chemical evolution of galaxies it is necessary to derive the total O/H ratio in H ii regions. To determine the total O/H ratio in H ii regions it is necessary to add to the gas-phase component the dust-phase component of O atoms. Based on the Fe/O ratio and other considerations we estimate the dust-phase fraction as a function of O/H.

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. 185 - 186
Copyright
Copyright © International Astronomical Union 2010

References

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