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Spectroscopy and Direct Imaging of the Planetary Nebula IC 4593.

Olguín, L.; Bohigas, J.

Spectroscopy of the planetary nebula IC 4593 leads to helium, oxygen, carbon, sulfur and argon abundances which are typical of non-type I planetaries. Nitrogen abundance is normal when UV data is used. Neon might be underabundant by a factor of 2. Images in various emission lines show that the nebula is composed of two internal structures dominate…

The Spatial Intensity Distribution of the UV Light in HH Objects. Revisited

Raga, A. C.; Noriega-Crespo, A.; Moro-Martin, A. +1 more

Simple kinematical bow shock models have successfully explained many of the observed features in Herbig-Haro objects. It is shown that similar models can be applied to the spatial intensity distribution of the UV lines observed by IUE. Archival IUE spectra have been used for the HH 1, HH 2(H+A^'), HH 2(G+B), HH 24A, HH 32A, HH 43(A+B+C),…