Computer Science
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6044g&link_type=abstract
HST Proposal ID #6044
Computer Science
Hst Proposal Id #6044 Interstellar Medium
Scientific paper
We will use the FOS to observe UV emission lines of carbon from H II regions in the spiral galaxies NGC 2403 and M101; this program was awarded observing time with medium priority in Cycle 3, but of six scheduled observations, only one was obtained before the HST refurbishment. These measurements, combined with corresponding optical spectra, will be used to derive carbon abundances and C/O ratios. Our measurements will provide the first reliable sample of data on carbon abundances in spiral galaxies. We will use the derived abundances to study the time evolution of C/O across the galaxies and compare the results with those obtained from observations of metal-poor irregular galaxies obtained by us in Cycle 2, and with 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 the spirals 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. We will compare the gradients for C and N across the galaxies to obtain an improved estimate of the fraction of N produced by primary nucleosynthesis. Finally, we will take deep HAlpha and O III images in parallel with the FOS observations to study the structure of the ionized gas in these galaxies at high resolution.
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