Refractory element depletion and the determination of abundances in H II regions

Details Refractory element depletion and the determination of abundances in H II regions Refractory element depletion and the determination of abundances in H II regions

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.261..306h&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 261, no. 2, p. 306-310.

Astronomy and Astrophysics

Astronomy

32

Abundance, H Ii Regions, Heavy Elements, Interstellar Chemistry, Iron, Magnesium, Photoionization, Silicon

Scientific paper

Photoionization models have been used to show that the strengths of abundance diagnostics such as O II 3727-A and O III 5007-A forbidden lines in low-excitation H II regions are very sensitive to the gas-phase depletion factors of refractory elements. As a result, observationally unconstrained levels of elements such as Mg, Si, and Fe employed in models to infer nebular properties may lead to uncertainties of a factor of 2 in the abundances of elements such as O, N, and S.

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