Other
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...319l..57w&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 319, Aug. 15, 1987, p. L57-L62. NSERC-supported res
Other
39
Abundance, Interstellar Gas, Ionized Gases, Nitrogen, Galactic Clusters, H Ii Regions, Nuclear Energy, Spatial Resolution, Stellar Coronas, Stellar Winds, Wolf-Rayet Stars
Scientific paper
The central complex of ionized gas in the amorphous galaxy NGC 5253 was scanned with the slit of the RGO spectrograph using the imaging spectroscopy system of the Anglo-Australian Telescope. Monochromatic images corresponding to several nebular lines were obtained with a spatial resolution of 2.3 x 1.3 sq arcsec (1 pixel). The very high signal-to-noise ratio of the spectra allowed the measurements of the electron temperature over 78 pixels using the line ratio forbidden O III (4959+5007)/4363 and hence abundances of O, N, He, and Ne. A region of high values of log N/O was found to correspond with the presence of a cluster of Wolf-Rayet stars. Other areas of the gas complex show the normal deficiency in log N/O for this type of object, and no Wolf-Rayet feature is detected. There is an anticorrelation between log N/O versus log O/H, a trend which is not clearly consistent with any existing nucleosynthesis scenario for the origin of nitrogen in low metallicity galaxies.
ROY Jean-Rene
Walsh Jeremy R.
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