Other
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6021k&link_type=abstract
HST Proposal ID #6021
Other
Hst Proposal Id #6021 Interstellar Medium
Scientific paper
We propose to obtain UV and optical spectra with the FOS to measure nebular abundances in NGC 5253, a Wolf-Rayet starburst galaxy that exhibits anomalous N/O ratios attributed to pollution from massive star winds. The primary focus of this program is to measure the relative carbon, nitrogen, and oxygen abundances in NGC 5253. We seek to establish the extent of short-term, localized abundance enhancements due to massive star populations, and evaluate C abundance measurements as a new tool for probing the chemical evolution history of starburst galaxies. Multiple FOS spectra over the wavelength range from 1600Angstrom to 6800Angstrom obtained through the same aperture will allow us to measure several ionization species and minimize uncertainties caused by unknown interstellar reddening and ionization correction factors that have plagued other UV spectroscopic studies. Specifically, we will measure the UV lines O III LambdaLambda1661 -- 1666, C III LambdaLambda1907 -- 1909, and N III LambdaLambda1748 -- 1754 simultaneously, which will enable us to measure the N^++/O^++, and C^++/O^++ ratios with very little uncertainty. This will allow us to confirm the N/O enhancement by measuring the favored ionic species of nitrogen (N^++), and test the claim that C is also enhanced in this region.
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