Computer Science
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4276g&link_type=abstract
HST Proposal ID #4276
Computer Science
Hst Proposal Id #4276
Scientific paper
We propose to observe UV emission lines of carbon from H II regions in the spiral galaxy NGC 2403. These measurements, combined with corresponding optical spectra, will be used to derive carbon abundances and C/O ratios across the disk of NGC 2403. Our measurements will provide the first good sample of data on carbon abundances across a spiral galaxy. We will use the derived abundances to study the time evolution of C/O across the galaxy and compare the results with those obtained from observations of stars in our own Galaxy as well as theoretical predictions for the behavior of C/O in spirals. In particular, we will make detailed comparisons between the behavior of C, N, He, and O in the outer parts of NGC 2403 with that observed in irregular galaxies of similar abundances; such comparison will tell us if the evolution of the outer disks of spirals has proceeded in similar fashion as for the irregulars. In addition, we will compare the gradients for C and N across the disk to obtain an improved estimate of the fraction of N produced by primary nucleosynthesis.
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