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

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

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010iaus..268..185p&link_type=abstract

Light Elements in the Universe, Proceedings of the International Astronomical Union, IAU Symposium, Volume 268, p. 185-186

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Ism: Abundances – H Ii Regions – Galaxies: Abundances, Evolution, Irregular – Galaxy: Disk – Early Universe

Scientific paper

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.

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