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Abundances of Refractory Elements in the Orion Nebula

  • R. H. Rubin (a1), E. F. Erickson (a1), M. R. Haas (a1), S.W.J. Colgan (a1), J. P. Simpson (a1) and R. J. Dufour (a2)...

Abstract

We assess the gas-phase abundances of Si, C, and Fe from our recent measurements of Si++, C++, and Fe++ in the Orion Nebula by expanding on our earlier “blister” models. The Fe++ 22.9 μm line measured with the KAO yields Fe/H ~ 3 × 10−6 - considerably larger than in the diffuse ISM, where relative to solar, Fe/H is down by ~ 100. However, in Orion, Fe/H is still lower than solar by a factor ~ 10. The C and Si abundances are derived from new IUE high dispersion spectra of the C++ 1907, 1909 Å and Si++ 1883, 1892 Å lines. Gas-phase Si/C = 0.016 in the Orion ionized volume and is particularly insensitive to uncertainties in extinction and temperature structure. The solar value is 0.098. Gas-phase C/H = 3 × 10−4 and Si/H = 4.8 × 10−6. Compared to solar, Si is depleted by 0.135 in the ionized region, while C is essentially undepleted. This suggests that most Si and Fe resides in dust grains even in the ionized volume.

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References

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Abundances of Refractory Elements in the Orion Nebula

  • R. H. Rubin (a1), E. F. Erickson (a1), M. R. Haas (a1), S.W.J. Colgan (a1), J. P. Simpson (a1) and R. J. Dufour (a2)...

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