Statistics – Computation
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.231.1025m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 231, April 15, 1988, p. 1025-1037. SERC-supported resea
Statistics
Computation
14
Abundance, Interstellar Extinction, Magnesium, Photoionization, Planetary Nebulae, Computational Astrophysics, High Resolution, Iue
Scientific paper
High-resolution IUE images have provided line profiles of emission cut by interstellar absorption in the magnesium II lines λλ 2795, 2802 Å in nine objects. The underlying emission has been reconstructed in seven of these and estimates of the ratio of intrinsic to observed emission ranging from 1.5 to 23 have been obtained. Photoionization models of IC 418, IC 4997 and NGC 2440 have been used to obtain Mg/H ratios from the corrected Mg II line strengths. The results indicate that depletion of Mg into grains is less than previously thought and reduce the observed gradient in the magnesium abundance. The Mg depletion may be related to the C/O ratio within the nebula; carbon-rich planetary nebulae may have less magnesium depletion than those with C/O < 1.
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