Abundance gradients from disk planetary nebulae: O, Ne, S, and AR

Details Abundance gradients from disk planetary nebulae: O, Ne, S, and AR Abundance gradients from disk planetary nebulae: O, Ne, S, and AR

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...282..436m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 282, no. 2, p. 436-443

Astronomy and Astrophysics

Astrophysics

115

Abundance, Gradients, Milky Way Galaxy, Planetary Nebulae, Accuracy, Argon, Astronomical Models, Chemical Evolution, H Ii Regions, Neon, Oxygen, Space Density, Sulfur

Scientific paper

A new determination of the radial abundance gradients of O/H, Ne/H, S/H, and Ar/H is made for disk planetary nebulae, (PN), that is, those objects of Peimbert types I, II, and III. On the basis of a sample containing 200 nebulae, it can be concluded that these gradients are generally similar, and of the same order of magnitude as the O/H gradient displayed by galactic HII regions. Some distance-independent correlations confirm the accuracy of the abundances and support the interpretaion of the gradients in terms of chemical evolution models. The time evolution ofthe abundance gradients in the Milky Way is investigated, and their variation with the types of PN are compared with predictions of chemical evolution models.

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