The Abundances and Time Evolution of Carbon, Nitrogen and Oxygen in Star-Forming Galaxies - Cont of 3840

Details The Abundances and Time Evolution of Carbon, Nitrogen and Oxygen in Star-Forming Galaxies - Cont of 3840 The Abundances and Time Evolution of Carbon, Nitrogen and Oxygen in Star-Forming Galaxies - Cont of 3840

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.5246s&link_type=abstract

HST Proposal ID #5246

Computer Science

Hst Proposal Id #5246

Scientific paper

We propose to observe UV emission lines of carbon, nitrogen, and oxygen from high-surface brightness extragalactic H II regions drawn from a sample of irregular and spiral galaxies having a large spread of known oxygen abundance (2% solar to nearly solar). From the emission-line data we will derive C/O and N/O abundance ratios for which systematic uncertainties - due to reddening corrections, temperature and density effects, and mismatched aperture sizes (typical in IUE+optical studies) - are greatly reduced. We will use the derived abundances to study the time evolution of C/O and N/O in nearby galaxies, and compare the results with those obtained from observations of stars in our own Galaxy. We will be able to test the suggestion (from far-infrared observations of H II regions) that nitrogen abundances derived from optical spectra are systematically in error by factors of two or more. We will also be able to measure the gas phase abundance of silicon, allowing us to study Si depletion as a function of metallicity. Our target sample size of 28 is sufficiently large to study both trends in relative abundances and search for anomalous regions (for example, those affected by the presence of WR stellar winds). The order of magnitude increase in s/n over IUE will allow the measurement of C/O and C/N with the requisite accuracy for the first time.

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