Abundance gradients from type II planetary nebulae

Details Abundance gradients from type II planetary nebulae Abundance gradients from type II planetary nebulae

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...158..228f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 158, no. 1-2, April 1986, p. 228-232. Research supported by the Fundacao de Am

Astronomy and Astrophysics

Astrophysics

53

Abundance, Mass Distribution, Milky Way Galaxy, Planetary Nebulae, Carbon, Distance, Electron Energy, Helium, Nitrogen, Oxygen, Sulfur, Temperature Distribution

Scientific paper

The existence of galactic abundance gradients is analysed taking into account a sample of type II planetary nebulae. Helium, oxygen, nitrogen, sulphur, and carbon gradients are considered, on the basis of recently published abundances and distances. Measurable radial gradients of He/H, O/H, N/H, S/H, S/O, and C/H are detected. The results are compared with the electron temperature gradient recently determined for type II planetary nebulae. From an analysis of the main cooling agents in the ionized gas, it is shown that the abundance gradients alone are able to explain the observed temperature gradient.

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