Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414..626p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 414, no. 2, p. 626-631.
Astronomy and Astrophysics
Astrophysics
109
Abundance, Hydrogen Ions, Line Spectra, Nebulae, Oxygen Ions, Oxygen Spectra, Astronomical Spectroscopy, Forbidden Transitions, H Ii Regions, Interstellar Matter, Orion Nebula, Planetary Nebulae, Recombination Reactions
Scientific paper
We present O(2+)/H(+) values for the Orion Nebula, M17, and NGC 6572 based on O II recombination lines, which are independent of the temperature structure of the observed nebulae. In the H II regions sampled (Orion and M17) the O(2+)/H(+) values derived from O II recombination lines are about a factor of two higher than those derived from O III forbidden lines. These differences can be accounted for by the presence of spatial temperature variations over the observed volumes. The abundances derived from the recombination lines eliminate the O/H discrepancy between the stellar values and the H II region values of the solar neighborhood.
Peimbert Manuel
Storey Peter J.
Torres-Peimbert Silvia
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