Abundance gradients in the outer galactic disk from planetary nebulae

Details Abundance gradients in the outer galactic disk from planetary nebulae Abundance gradients in the outer galactic disk from planetary nebulae

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...345..629m&link_type=abstract

Astronomy and Astrophysics, v.345, p.629-634 (1999)

Astronomy and Astrophysics

Astrophysics

92

Ism: Abundances, Ism: Planetary Nebulae: General, Galaxy: Abundances

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 > R_0 = 7.6 kpc, 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 R_0. 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. Table~1 is available only electronically at the CDS(anonymous ftp 130.79.128.5 or http://cdsweb.u-strasbg.fr/Abstract.html)

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