Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..199g&link_type=abstract
In NASA. Goddard Space Flight Center Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 199 (SEE N85-20961 11-89
Astronomy and Astrophysics
Astronomy
Interstellar Chemistry, Interstellar Matter, Ultraviolet Spectra, Carbon, Chemical Composition, Gallium, Germanium, H Ii Regions, Iron, Iue, Metastable State, Molecules, Nickel, Silicon
Scientific paper
About 350 spectra of 40 stars were obtained from the IUE Vilspa data bank and analyzed. The preliminary results include the discovery of lines due to interstellar germanium, gallium, and krypton. These elements are much less depleted than the iron group elements (it is possible that they are almost undepelted). Several intercombination lines of Fe II and several Ni II lines were discovered. With the observations of the intercombination lines the column densities can be easily derived since the lines are on the linear part of the curve of growth. It was also found that, there is a qualitative difference between the lines of highly ionized species such as C IV, Si IV arising in H II regions on the one hand and those arising in interstellar medium where no H II region can be traced. The H II region lines are considerably narrower. In both cases, however, multiple components are seen. Other results regarding the detection of Fe I and Mg I lines and lines from highly metastable levels of excited species are discussed.
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