Computer Science
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pnas...82.2202f&link_type=abstract
Proceedings of the National Academy of Sciences of the United States of America, Volume 82, Issue 8, pp. 2202-2206
Computer Science
27
Scientific paper
Observations with the image tube scanner at the Shane 3-m telescope are combined with data obtained with the International Ultraviolet Explorer to assess the spectrum of the remarkable high-excitation planetary nebula NGC 6537. We have analyzed the spectrum of this nitrogen-rich object with the aid of the theoretical nebular models. The models permit one to estimate the fraction of unobservable ions of abundant elements. On the scale log N(H) = 12, the logarithmic abundance values for He, C, N, and O are as follows: [Note: Table omitted. See the image of page 2202 for this table.] The abundances of Ne S, Cl, and Ar appear to be essentially solar to within a factor of 2. Our interpretation is that the progenitor of NGC 6537 had a chemical composition not differing greatly from that of the Sun. In the course of its prenebular evolution, C and probably O were converted to N and much H was converted to helium.
Aller Lawrence H.
Czyzak Stanley J.
Feibelman Walter
Keyes Charles D.
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