Final Report - NASA Grant NAG 5-262

Physics – Space Physics

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H Ii Regions, Galaxies, Detection, Iue, Planetary Nebulae, Spectrum Analysis, Ultraviolet Spectra, Spectroscopy, Populations, Carbon, Halos, Observatories, Sagittarius Constellation

Scientific paper

This report concentrates on research and publications during the past two years, or that related to the 15th and 16th episodes of the IUE Observatory. The observations of M17 were unsuccessful in detecting the C3 lambda 1909 needed to determine the carbon abundance in this nebula. An analysis of M17 spectra, as well as those of another Galactic HII region -M8-, was conducted for the purpose of determining the C abundance in a Sagittarius-Arm HII region. The M8 IUE SWP spectra showed the C3 lambda 1909 line clearly, and were combined with ground-based spectroscopy. The most notable results found for M8 were that the CNO abundance derived for it were very similar to that previously found for the Orion Nebula. The second 15th year guest observer program involved IUE high dispersion observations of the Galactic halo planetary nebula BB-1. The results indicated that BB-1 is among the PNe with the highest C/O and Ne/O ratios every found in such ejected shells from old stars of mass similar to the sun. This has significant ramifications regarding the chemical enrichment by PNe in the early history of the Galaxy, as well as raising new questions regarding the nuceosythesis of C, N, and Ne is PNe from Population 2 stars. An effort was lead to compare the HST spectra with old- and NEWSIPS-processed IUE spectra of the same objects. It was found that, while the HST FOS UV spectra were of course superior to the low dispersion IUE spectra in several cases.

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