Journal
ASTRONOMY & ASTROPHYSICS
Volume 423, Issue 1, Pages 199-207Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20034539
Keywords
ISM : planetary nebulae : general; Galaxy : disk; ISM : abundances
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In this paper we report new observations and derive chemical abundances for a sample of 26 planetary nebulae (PN) located in the anticenter direction. Most of these nebulae are far away objects, located at Galactocentric distances greater than about 8 kpc, so that they are particularly useful for the determination of the radial gradients at large distances from the galactic center. A comparison of the present results With previously determined abundances suggests that the radial abundance gradients flatten out at distances larger than about 10 kpc from the center.
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