Other
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...356..229h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 356, June 10, 1990, p. 229-240.
Other
63
Abundance, Helium, Neon, Nitrogen, Oxygen, Planetary Nebulae, Andromeda Galaxy, Correlation Coefficients, Magellanic Clouds, Milky Way Galaxy, Nuclear Fusion, Stellar Mass
Scientific paper
Abundances of He, N, O, and Ne have been uniformly calculated for 192 planetary nebulas residing in the Galactic disk and halo, the LMC, the SMC, and M31. Direct correlations appear to exist for type I as well as non-type I objects for the following pairs of parameters: N/O-He/H, N/O-N/H, and Ne/H-O/H. Separately, type I planetaries show a weak anticorrelation between N/O and O/H, while non-type I's exhibit direct correlations between N/H and O/H and between N/O and O/H. From these patterns, it is inferred that non-type I's synthesize N via the CN cycle. Type I planetaries, on the other hand, manufacture N at least partially via the ON cycle, destroying O in the process. Neither type appears to synthesize O or Ne.
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