Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21110012s&link_type=abstract
American Astronomical Society, AAS Meeting #211, #100.12; Bulletin of the American Astronomical Society, Vol. 39, p.913
Astronomy and Astrophysics
Astronomy
Scientific paper
We present new IR spectroscopic data obtained with the Spitzer Space Telescope of the halo planetary nebula DdDm-1. We combine these data with UV data from HST FOS and our own previously published optical measurements to derive nebular abundances of He, C, N, O, Ne, Si, S, Cl, Ar, and Fe. Our abundance determinations include the use of the newly developed program ELSA for obtaining abundances directly from emission line strengths with detailed photoionization models to render an accurate set of abundances for this object. The metallicity, as gauged by oxygen, is found to be 0.46 dex below the solar value, confirming DdDm-1's status as a halo PN. In addition, we find that Si and Fe are markedly underabundant, suggesting their depletion onto dust. The very low C/O ratio suggests that the chemistry of the nebula should be consistent with an oxygen-rich environment. We find that the sulfur abundance of DdDm-1 is only slightly below the value expected based upon the normal lockstep behavior between S and O observed in H II regions and blue compact galaxies.
Dufour Reginald James
Henry Richard B. C.
Kwitter Karen B.
Skinner Julie N.
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