Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980esasp.157..131g&link_type=abstract
The second European International Ultraviolet Explorer (IUE) Conference, held 26-28 March 1980 in Tübingen, West Germany. Edited
Astronomy and Astrophysics
Astronomy
2
Galactic Structure, H Ii Regions, Hydrogen, Interstellar Gas, Iue, Ultraviolet Astronomy, Absorption Spectra, Carbon, Electron Density (Concentration), Emission Spectra, H Alpha Line, Interstellar Extinction, Interstellar Matter
Scientific paper
H2 regions in the galaxies NGC 2366 and IC 2574 were observed wit the International Ultraviolet Explorer (IUE) at low resolution. The spectra show the 2200A absorption feature and many emission lines. The spectrum of each of the H2 regions, when smoothed into 10A wavelength intervals, shows two broad depressions centered at 2175A and 1685A. It was not possible to identify the latter further than to suggest that it may be caused by a conglomeration of absorption lines of the iron group of elements in various stages of ionization. The line spectra show many absorption lines as well as collisionally excited forbidden and semiforbidden emission lines. The spectrum of NGC 2366 is dominated by emission lines the strongest being C3. The emission spectrum of IC 2574 is very weak, suggesting that the ionizing photons arise from stars cooler than those ionizing NGC 2366. Electron densities were computed: 20 per cu cm for NGC 2366 and 15 per cu cm for IC 2574.
Gondhalekar P. M.
Morgan David H.
Nandy K.
Wilson Raymond
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