Abundance of oxygen in the Magellanic galaxy NGC 2366

Details Abundance of oxygen in the Magellanic galaxy NGC 2366 Abundance of oxygen in the Magellanic galaxy NGC 2366

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993stin...9434725d&link_type=abstract

M.S. Thesis Laval Univ. (Quebec). Dept. of Physics.

Physics

Astronomical Spectroscopy, H Ii Regions, Irregular Galaxies, Oxygen, Spectrophotometry, Abundance, Galactic Evolution, Image Processing, Interstellar Matter, Metallicity

Scientific paper

The production of heavy elements in a galaxy is connected to the rate of formation of massive stars. Consequently, the present abundance of these elements should be linked to the history of star formation across a galaxy. A study of abundances should then clarify the mechanisms of galactic evolution. In any case, from the observational point of view, problems of sub-sampling occur (too few regions observed, too few galaxies). Nevertheless, by using the method of spectrophotometric imaging, it is now possible to overcome this problem by observing more than 50 points per galaxy. In this manner, the abundance of oxygen in 67 H II regions of the irregular Magellanic galaxy NGC 2366 have been measured. Starting from these observations, it has been shown that the average abundance of oxygen is 12 + log(O/H), about 8.5, and that this abundance has no radial gradient. These observations add to the very limited sample of Magellanic galaxies observed to date (Large and Small Magellanic Clouds, NGC 6822). In addition, this method has allowed ready formation of maps of line ratios of H II regions, thus furnishing a supplementary tool for analyzing these objects.

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