Other
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981rmxaa...6..309p&link_type=abstract
(International Astronomical Union, Reunion Regional Latinoamericana de Astronomia, 2nd, Merida, Venezuela, Jan. 19-23, 1981) Rev
Other
9
Abundance, Astronomical Models, Astronomical Spectroscopy, Chemical Composition, Planetary Nebulae, Ultraviolet Spectra, Carbon, Emission Spectra, Iue, Line Spectra, Oxygen, Stellar Evolution, Temperature Distribution, Visible Spectrum
Scientific paper
IUE observations of emission lines in the spectrum of NGC 7662 in the 1150-3300 A range are presented. Combining these observations with optical data obtained by other investigators, the chemical composition for this object is derived. The values obtained are as follows: log C = -3.07, log N = -3.73, log O = -3.09, and log Ne = -3.70. Models of the ionization structure and thermal balance are computed for comparison with the observational data. The values for log O/H and log C/O obtained here are larger than solar values. It is noted that other planetary nebulae have shown a large C/O ratio and that those in the halo have a mean ratio log C/O = 1.1 (Torres-Peimbert, Rayo and Peimbert 1981). The enrichment of the ejected nebula is thought to be showing the effects of the internal evolution of the progenitor star.
Peña Manuel
Torres-Peimbert Silvia
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