Abundance patterns in planetary nebulae

Journal Article · Fri Jun 01 04:00:00 EDT 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/168833· OSTI ID:6934518

Henry, R B.C. ^[1]

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1. Oklahoma Univ., Norman (USA)

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. 64 refs.

• OSTI ID: 6934518
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 356; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
CHEMICAL COMPOSITION
CNO CYCLE
CORRELATIONS
ELEMENT ABUNDANCE
ELEMENTS
FLUIDS
GALAXIES
GASES
HELIUM
MAGELLANIC CLOUDS
MASS
MILKY WAY
NEBULAE
NEON
NITROGEN
NONMETALS
NUCLEOSYNTHESIS
OXYGEN
PLANETARY NEBULAE
RARE GASES
STAR BURNING
SYNTHESIS