Abundance gradients in planetary nebulae (Maciel+, 1999)

Details Abundance gradients in planetary nebulae (Maciel+, 1999) Abundance gradients in planetary nebulae (Maciel+, 1999)

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ycat..33450629m&link_type=abstract

VizieR On-line Data Catalog: J/A+A/345/629. Originally published in: 1999A&A...345..629M

Computer Science

Planetary Nebulae, Abundances: Peculiar

Scientific paper

Radial abundance gradients of the element ratios O/H, Ne/H, S/H, and Ar/H are determined on the basis of a sample of disk planetary nebulae. The behaviour of the gradients at large distances from the galactic centre, R>R0=7.6kpc, is emphasized. It is concluded that the derived gradients are consistent with an approximately constant slope in the inner parts of the Galaxy, and some flattening for distances larger than R0. A comparison is made with previous determinations using both photoionized nebulae and young stars, and some consequences on theoretical models for the chemical evolution of the galactic disk are discussed.
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