Chemical abundances of planetary nebulae towards the direction of the galactic anticenter

Details Chemical abundances of planetary nebulae towards the direction of the galactic anticenter Chemical abundances of planetary nebulae towards the direction of the galactic anticenter

2004-05-03

arxiv.org/abs/astro-ph/0405018v1

Astron.Astrophys. 423 (2004) 199-207

Astronomy and Astrophysics

Astrophysics

10 pages, 4 encapsulated postscript figures, LaTeX, uses Astronomy and Astrophysics macro aa.cls, graphicx package, to be publ

Scientific paper

10.1051/0004-6361:20034539

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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